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Exhibit 10.28 REGISTRATION RIGHTS AGREEMENT THIS REGISTRATION RIGHTS AGREEMENT(the Agreement") is entered into as of
December 3, 2003, by and among Entrx Corporation, a Delaware corporation (the
Company"), and Pandora Select Partners L.P., a British Virgin Islands limited
partnership (the Investor"). R E C I T A L S : WHEREAS, the Company has entered into that certain Purchase Agreement,
dated as of the date hereof (the Purchase Agreement") with the Investor
pursuant to which the Company has agreed to issue and sell to the Investor a
promissory note (the Note) convertible into shares of the Companys Common
Stock, $0.10 par value per share (the Common Stock) and a warrant to purchase
additional shares of Common Stock (the Warrant); WHEREAS, the Company may make certain principal and interest payments on
the Note by issuance of additional shares of its Common Stock; WHEREAS, the Company has agreed to grant certain registration rights with
respect to the shares of the Companys Common Stock issuable as payments under
the Note, upon conversion of the Note or upon exercise of the Warrant; NOW, THEREFORE, in consideration of the foregoing and of the mutual
promises and covenants contained herein, and for other good and valuable
consideration, the receipt and sufficiency of which are hereby acknowledged,
the parties, intending to be legally bound, hereby agree as follows: ARTICLE 1
DEFINITIONS As used herein, the following terms shall have the following respective
meanings: 1.1 Commissionshall mean the U.S. Securities and Exchange Commission or any
other successor federal agency at the time administering the Securities Act. 1.2 Common Stockshall mean the Companys common stock, $0.10 par value per
share. 1.3 Exchange Actshall mean the Securities and Exchange Act of 1934, as
amended, or any similar federal statute and the rules and regulations of the
Commission thereunder, all as the same shall be in effect at the time. 1.4 Holdersshall mean and include the Investor and any transferee thereof
who holds Registrable Securities of record. 1.5 Register, registeredand registrationrefer to a registration
effected by preparing and filing with the Commission a registration statement
in compliance with the Securities Act, and the declaration or ordering by the
Commission of the effectiveness of such registration statement. 1.6 Registrable Securitiesmeans any and all shares of Common Stock: (i)
issued or issuable as payments under the Note, upon conversion of the Note or
upon exercise of the Warrant or (ii) issued or issuable with respect to the
Common Stock upon any stock split, stock dividend, recapitalization,
reclassification, merger, consolidation or other similar event; excluding in
all cases, however, Registrable Securities sold by a Holder to the public
pursuant




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to a registered offering or pursuant to Rule 144 promulgated under the
Securities Act or sold in a private transaction in which the Holders
registration rights under this Agreement are not assigned. 1.7 Registration Expensesshall mean all expenses incurred by the Company in
complying with Articles 2 and 3 hereof, including, without limitation, all
registration, qualification and Commission, National Association of Securities
Dealers, Inc., stock exchange and other filing fees, printing expenses, escrow
fees, fees and disbursements of legal counsel for the Company, blue sky fees
and expenses, and the expense of any special audits incident to or required by
any such registration (but excluding the compensation of regular employees of
the Company, which shall be paid in any event by the Company). 1.8 Securities Actshall mean the Securities Act of 1933, as amended, or any
similar federal statute and the rules and regulations of the Commission
thereunder, all as the same shall be in effect at the time. 1.9 Selling Expensesshall mean all underwriting fees, discounts, selling
commissions and stock transfer taxes applicable to the Registrable Securities
registered by the Holders and the fees and expenses of any special counsel
engaged by the Holders. 1.10 Underwritershall mean (whether or not the term is capitalized) a
broker-dealer engaged by the Company to distribute Registrable Securities as
principal or agent. 1.11 Underwritingor Underwrittenshall mean (whether or not the term is
capitalized) a method of publicly distributing securities through an
Underwriter. ARTICLE 2 REQUIRED REGISTRATION 2.1 Required Registration. Not later than April 15, 2004 (unless a majority in
interest of the Holders request a delay of the Company for up to an additional
90 days in writing and in such case, upon expiration of this requested delaying
period), the Company will prepare and file with the Commission a registration
statement under the Securities Act (currently expected to be on Form S-2)
covering all of the Registrable Securities and use its best efforts to obtain
the effectiveness of such registration as soon as practicable as would permit
or facilitate the original issuance or subsequent resale and distribution of
all of such Registrable Securities. The Companys failure to obtain
effectiveness of this registration statement by June 1, 2004 (subject to an
extension of such date to correspond to a filing date extension, if any,
granted by the Holders above, and subject to delays incurred by any Holders
failure to comply with the provisions of Section 5(b) below) will commence the
running of the first Failure Term as defined in Section 5(e) of the Warrant
and will also constitute an event of default under this Agreement. 2.2 Underwriting. (a) The resale distribution of the Registrable Securities covered by the
registration statement referred to in Section 2.1 above shall be effected by
means of the method of distribution selected by the Holders holding a majority
of the Registrable Securities covered by such registration. The Holders
holding a majority of the Registrable Securities may also change the resale
distribution method from time to time (subject to amendment of the registration
statement as required to describe such changes). If such distribution is
effected by means of an underwriting, the right of any Holder to registration
pursuant to this Article 2 shall be conditioned upon such Holders
participation in such underwriting and the inclusion of such Holders
Registrable Securities in the underwriting (unless otherwise agreed by the
Initiating Holders) to the extent provided herein. (b) If such distribution is effected by means of an underwriting, the
Company (together with all Holders proposing to distribute their securities
through such underwriting) shall enter into an underwriting agreement in
customary form with a managing underwriter of nationally recognized standing
selected for such




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underwriting by a majority in interest of the Holders and approved by the
Company, which approval shall not be unreasonably withheld. (c) If any Holder disapproves of the terms of the underwriting, such
person may elect to withdraw therefrom by written notice to the Company, the
managing underwriter and the other Holders. The Registrable Securities and/or
other securities so withdrawn shall also be withdrawn from registration. 2.3 Inclusion of Shares by the Company. If the resale distribution of
Registrable Securities is being effected by means of an underwriting and if the
managing underwriter will not limit the number of Registrable Securities to be
underwritten, the Company may include securities for its own account or for the
account of others in such registration if the managing underwriter so agrees.
The inclusion of such shares shall be on the same terms as the registration of
shares held by the Holders. In the event that the underwriters exclude some of
the securities to be registered, the securities to be sold for the account of
the Company and any other holders shall be excluded in their entirety prior to
the exclusion of any Registrable Securities. ARTICLE 3 COMPANY REGISTRATION 3.1 Notice of Registration to Holders. If at any time or from time to time
commencing after the date hereof, the Company shall determine to register any
of its securities, either for its own account or the account of a security
holder or holders, other than (i) a registration relating solely to employee
benefit plans on Form S-8 (or any successor form) or (ii) a registration
relating solely to a Commission Rule 145 transaction on Form S-4 (or any
successor form), the Company will: (a) promptly give to each Holder written notice thereof and (b) include in such registration (and any related qualification under blue
sky laws or other compliance), and in any underwriting involved therein, all
the Registrable Securities specified in a written request or requests, made
within 30 days after receipt of such written notice from the Company described
in Section 3.1(a), by any Holder or Holders, but only to the extent that (i) if
the proposed registration under this Article 3 is not an underwritten offering,
the original issuance or resale distribution of such Registrable Securities is
not already covered by an effective registration statement under Article 2
above or (ii) if the proposed registration under this Article 3 is an
underwritten offering, such Registrable Securities are not then being offered
in a separate underwritten offering under Article 2 above. 3.2 Underwriting. If the registration of which the Company gives notice is for
an offering involving an underwriting, the Company shall so advise the Holders
as a part of the written notice given pursuant to Section 3.1(a). In such
event, the right of any Holder to registration pursuant to this Article 3 shall
be conditioned upon such Holders participation in such underwriting and the
inclusion of such Holders Registrable Securities in the underwriting to the
extent provided herein. All Holders proposing to distribute their securities
through such underwriting shall (together with the Company) enter into an
underwriting agreement in customary form with the managing underwriter selected
for such underwriting by the Company. (a) Notwithstanding any other provision of this Article 3, if the managing
underwriter determines that marketing factors require a limitation of the
number of shares to be underwritten, the underwriter may exclude some or all
Registrable Securities from such registration and underwriting. The Company
shall so advise all Holders of Registrable Securities, and the number of shares
of Common Stock to be included in such registration shall be allocated as
follows: first, for the account of the Company, all shares of Common Stock
proposed to be sold by the Company; and second, for the account of the Holders
and any other shareholders of the Company participating in such registration,
the number of shares of Common Stock requested to be included in the
registration by the Holders and such other shareholders in proportion, as
nearly as practicable, to the respective amounts of Registrable




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Securities that are proposed to be offered and sold by the Holders and
such other shareholders of Registrable Securities at the time of filing the
registration statement. No Registrable Securities excluded from the
underwriting in this Article 3 by reason of the underwriters marketing
limitation shall be included in such registration. (b) The Company shall so advise all Holders and the other holders
distributing their securities through such underwriting of any such limitation,
and the number of shares of Registrable Securities held by Holders that may be
included in the registration. If any Holder disapproves of the terms of any
such underwriting, such Holder may elect to withdraw therefrom by written
notice to the Company and the managing underwriter. Any securities excluded or
withdrawn from such underwriting shall be withdrawn from such registration, but
the Holder shall continue to be bound by the terms hereof. (c) The Company shall have the right to terminate or withdraw any
registration initiated by it under this Article 3 prior to the effectiveness of
such registration, whether or not a Holder has elected to include Registrable
Securities in such registration. ARTICLE 4
EXPENSES OF REGISTRATION All Registration Expenses incurred in connection with any registration,
qualification or compliance pursuant to Articles 2 and 3 hereof shall be borne
by the Company. All Selling Expenses relating to Registrable Securities
registered by the Holders shall be borne by the Holders of such Registrable
Securities pro rata on the basis of the number of shares so registered. ARTICLE 5
REGISTRATION PROCEDURES (a) In the case of each registration effected by the Company pursuant to
this Agreement, the Company will keep each Holder advised in writing as to the
initiation of each registration and as to the completion thereof. The Company
agrees to use its best efforts to effect or cause such registration to permit
the sale of the Registrable Securities covered thereby by the Holders thereof
in accordance with the intended method or methods of distribution thereof
described in such registration statement. In connection with any registration
of any Registrable Securities, the Company shall, as soon as reasonably
possible: (i) prepare and file with the Commission a registration statement
with respect to such Registrable Securities and use its efforts to cause
such registration statement filed to become effective; (ii) prepare and file with the Commission such amendments and
supplements to such registration statement and the prospectus included
therein as may be necessary to effect and maintain the effectiveness of
such registration statement as may be required by the applicable rules
and regulations of the Commission and the instructions applicable to the
form of such registration statement (provided, however, that the Company
shall not be obliged to maintain the effectiveness of the registration
statement described in Article 2 longer than through the earlier of (A)
seven years from the date hereof or, if earlier, the second anniversary
of the date on which the last of the Registrable Securities are issued or
issuable as payment under the Note, upon conversion of the Note or upon
exercise of the Warrant, (B) the date on which the Holder may sell all
Registrable Securities then held by the Holder, or which may become
issuable as payment under the Note, upon conversion of the Note or upon
exercise of the Warrant, without restriction by the volume limitations of
Rule 144(e) of the Securities Act or (C) such time as all Registrable
Securities held by such Holder, or which may become issuable as payment
under the Note, upon conversion of the Note or upon exercise of the
Warrant, have been sold pursuant to a registration statement), and
furnish to the holders of the Registrable Securities covered thereby
copies of any such supplement or amendment prior to this being used
and/or filed with the Commission;




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(iii) promptly notify the Holders of Registrable Securities to be
included in a registration statement hereunder, the sales or placement
agent, if any, therefor and the managing underwriter of the securities
being sold, and confirm such advice in writing, (A) when such
registration statement or the prospectus included therein or any
prospectus amendment or supplement or post-effective amendment has been
filed, and, with respect to such registration statement or any
post-effective amendment, when the same has become effective, (B) of the
issuance by the Commission of any stop order suspending the effectiveness
of such registration statement or the initiation of any proceedings for
that purpose, (C) of the receipt by the Company of any notification with
respect to the suspension of the qualification of the Registrable
Securities for sale in any jurisdiction or the initiation or threatening
of any proceeding for such purpose or (D) if, to the Companys knowledge,
it shall be the case, at any time when a prospectus is required to be
delivered under the Securities Act, that such registration statement or
prospectus, or any document incorporated by reference in any of the
foregoing, contains an untrue statement of a material fact or omits to
state any material fact required to be stated therein or necessary to
make the statements therein not misleading in light of the circumstances
then existing; (iv) use its best efforts to obtain the withdrawal of any order
suspending the effectiveness of such registration statement or any
post-effective amendment thereto or of any order suspending or preventing
the use of any related prospectus or suspending the qualification of any
Registrable Securities included in such registration statement for sale
in any jurisdiction at the earliest practicable date; (v) furnish to each Holder of Registrable Securities to be included
in such registration statement hereunder, each placement or sales agent,
if any, therefor and each underwriter, if any, thereof a conformed copy
of such registration statement, each such amendment and supplement
thereto (in each case excluding all exhibits and documents incorporated
by reference) and such number of copies of the registration statement
(excluding exhibits thereto and documents incorporated by reference
therein unless specifically so requested by such holder, agent or
underwriter, as the case may be) of the prospectus included in such
registration statement (including each preliminary prospectus and any
summary prospectus), in conformity with the requirements of the
Securities Act, as such Holder, agent, if any, and underwriter, if any,
may reasonably request in order to facilitate the disposition of the
Registrable Securities owned by such Holder sold by such agent or
underwritten by such underwriter and to permit such Holder, agent and
underwriter to satisfy the prospectus delivery requirements of the
Securities Act; (vi) use its best efforts to (A) register or qualify the Registrable
Securities to be included in such registration statement under such other
securities laws or blue sky laws of such states of the United States or the
District of Columbia to be designated by the Holders of a majority of such
Registrable Securities participating in such registration and each placement
or sales agent, if any, therefor and underwriter, if any, thereof, as any
Holder and each underwriter, if any, of the securities being sold shall
reasonably request (provided, that the Company shall not be required to use
its best efforts to register or qualify the Registrable Securities in more
than 10 such jurisdictions unless the expenses thereof are borne by the
Holders requesting such efforts), (B) keep such registrations or
qualifications in effect and comply with such laws so as to permit, as to a
registration statement filed under Article 2 above, the continuance of
offers, sales and dealings therein in such jurisdictions for the same period
after the initial effective date of the registration statement filed under
the Securities Act as described in Section 5(a)(ii) above or, as to a
registration statement filed under Article 3 above, for a period of 90 days
after the effective date of the registration statement, or if underwritten,
as long as may be necessary to enable the underwriter to complete its
distribution of the Registrable Securities pursuant to such registration
statement and (C) take any and all such actions as may be reasonably
necessary or advisable to enable such Holder, agent, if any, and underwriter
to consummate the disposition in such jurisdictions of such Registrable
Securities; provided, however, that in order to fulfill the foregoing
obligations under this Section 5(a)(vi), the Company shall not (unless
otherwise required to do so in any




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jurisdiction) be required to (1) qualify generally to do business as a
foreign company or a broker-dealer, (2) execute a general consent to service
of process or (3) subject itself to taxation; and (vii) furnish, at the request of a majority of the Holders
participating in the registration, on the date that such Registrable
Securities are delivered to the underwriters for sale, if such securities
are being sold through underwriters, or, if such securities are not being
sold through underwriters, on the date that the registration statement
with respect to such securities becomes effective, (i) an opinion, dated
as of such date, of the counsel representing the Company for the purposes
of such registration, in form and substance as is customarily given to
underwriters in an underwritten public offering and reasonably
satisfactory to a majority in interest of the Holders requesting
registration, addressed to the underwriters, if any, and to the Holders
requesting registration of Registrable Securities and (ii) a letter dated
as of such date, from the independent certified public accountants of the
Company, in form and substance as is customarily given by independent
certified public accountants to underwriters in an underwritten public
offering and reasonably satisfactory to a majority in interest of the
Holders requesting registration, addressed to the underwriters, if any,
and if permitted by applicable accounting standards, to the Holders
requesting registration of Registrable Securities. (b) The Company may require each Holder of Registrable Securities as to
which any registration is being effected to furnish to the Company such
information regarding such Holder and such Holders method of distribution of
such Registrable Securities as the Company may from time to time reasonably
request in writing. Each such Holder agrees to notify the Company as promptly
as practicable of any inaccuracy or change in information previously furnished
by such Holder to the Company or of the occurrence of any event in either case
as a result of which any prospectus relating to such registration contains or
would contain an untrue statement of a material fact regarding such Holder or
the distribution of such Registrable Securities or omits to state any material
fact regarding such Holder or the distribution of such Registrable Securities
required to be stated therein or necessary to make the statements therein not
misleading in light of the circumstances then existing, and promptly to furnish
to the Company any additional information required to correct and update any
previously furnished information or required so that such prospectus shall not
contain, with respect to such Holder or the distribution of such Registrable
Securities, an untrue statement or a material fact or omit to state a material
fact required to be stated therein or necessary to make the statements therein
not misleading in light of the circumstances then existing. (c) Each of the Holders will comply with the provisions of the Securities
Act with respect to disposition of the Registrable Securities to be included in
any registration statement filed by the Company. ARTICLE 6 INDEMNIFICATION 6.1 The Company will indemnify each Holder, each of its officers, directors and
partners, and such Holders legal counsel and independent accountants, if any,
and each person controlling any such persons within the meaning of Section 15
of the Securities Act, with respect to which registration, qualification or
compliance has been effected pursuant to this Agreement, and each underwriter,
if any, and each person who controls any underwriter within the meaning of
Section 15 of the Securities Act, against all expenses, claims, losses, damages
and liabilities (or actions in respect thereof), including any of the foregoing
incurred in settlement of any litigation, commenced or threatened, arising out
of or based on any untrue statement (or alleged untrue statement) of a material
fact contained in any registration statement, prospectus, offering circular or
other document, or any amendment or supplement thereof, incident to any such
registration, qualification or compliance, or based on any omission (or alleged
omission) to state therein a material fact required to be stated therein or
necessary to make the statements therein not misleading, or any violation by
the Company of any rule or regulation promulgated under the Securities Act or
any state securities laws applicable to the Company and relating to action or
inaction by the Company in connection with any such registration, qualification
or compliance, and will reimburse each such Holder, each of its officers,
directors and partners and such Holders legal counsel and independent
accountants, and each person controlling any such




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persons, each such underwriter and each person who controls any such
underwriter, for any legal and any other expenses reasonably incurred in
connection with investigating, preparing or defending any such claim, loss,
damage, liability or action; provided, however, that the Company will not be
liable in any such case to the extent that any such claim, loss, damage,
liability or expense arises out of or is based on any untrue statement or
omission or alleged untrue statement or omission made in reliance upon and in
conformity with written information furnished to the Company by such Holder,
officers, directors, partners, legal counsel, accountants, underwriter or
controlling persons, and expressly intended for use in such registration
statement, prospectus, offering circular or other document, or any amendment or
supplement thereof. 6.2 Each Holder will, if Registrable Securities held by such Holder are
included in the securities as to which such registration, qualification or
compliance is being effected, indemnify the Company, each of its directors and
officers and its legal counsel and independent accountants, each underwriter,
if any, of the Companys securities covered by such a registration statement,
each person who controls the Company or such underwriter within the meaning of
Section 15 of the Securities Act, and each other such Holder, each of its
officers, directors, partners, legal counsel and independent accountants, if
any, and each person controlling such Holder within the meaning of Section 15
of the Securities Act, against all expenses, claims, losses, damages and
liabilities (or actions in respect thereof), including any of the foregoing
incurred in settlement of any litigation, commenced or threatened, arising out
of or based on any untrue statement (or alleged untrue statement) of a material
fact contained in any such registration statement, prospectus, offering
circular or other document, or any amendment or supplement thereto, incident to
any such registration, qualification or compliance or based on any omission (or
alleged omission) to state therein a material fact required to be stated
therein or necessary to make the statements therein not misleading, and will
reimburse the Company, such Holders, such directors, officers, partners, legal
counsel, independent accountants, underwriters or control persons for any legal
or any other expenses reasonably incurred in connection with investigating,
preparing or defending any such claim, loss, damage, liability or action, in
each case to the extent, but only to the extent, that such untrue statement (or
alleged untrue statement) or omission (or alleged omission) is made in such
registration statement, prospectus, offering circular, other document or
amendment or supplement in reliance upon and in conformity with written
information furnished to the Company by such Holder and expressly intended for
use in such registration statement, prospectus, offering circular or other
document, or any amendment or supplement thereof; provided, however, that the
obligations of each Holder hereunder shall be limited to an amount equal to the
proceeds to such Holder of Registrable Securities sold as contemplated herein. 6.3 Each party entitled to indemnification under this Section 6 (the
Indemnified Party") shall give notice to the party required to provide
indemnification (the Indemnifying Party") promptly after such Indemnified
Party has actual knowledge of any claim as to which indemnity may be sought,
and shall permit the Indemnifying Party to assume the defense of any such claim
or any litigation resulting therefrom, provided that counsel for the
Indemnifying Party, who shall conduct the defense of such claim or litigation,
shall be approved by the Indemnified Party (whose approval shall not
unreasonably be withheld). The Indemnified Party may participate in such
defense at such partys expense; provided, however, that the Indemnifying
Party shall bear the expense of such defense of the Indemnified Party if
representation of both parties by the same counsel would be inappropriate due
to actual or potential conflicts of interest. The failure of any Indemnified
Party to give notice as provided herein shall not relieve the Indemnifying
Party of its obligations under this Agreement, unless such failure is
prejudicial to the ability of the Indemnifying Party to defend the action. No
Indemnifying Party, in the defense of any such claim or litigation, shall,
except with the consent of each Indemnified Party, consent to entry of any
judgment or enter into any settlement which does not include as an
unconditional term thereof the giving by the claimant or plaintiff to such
Indemnified Party of a release from all liability in respect of such claim or
litigation. 6.4 If the indemnification provided for in Section 6.1 or 6.2 is unavailable or
insufficient to hold harmless an Indemnified Party, then each Indemnifying
Party shall contribute to the amount paid or payable by such Indemnified Party
as a result of the expenses, claims, losses, damages or liabilities (or actions
or proceedings in respect thereof) referred to in Section 6.1 or 6.2, in such
proportion as is appropriate to reflect the relative fault of the Company on
the one hand and the sellers of Registrable Securities on the other hand in
connection with statements or omissions




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which resulted in such losses, claims, damages or liabilities (or actions or
proceedings in respect thereof) or expenses, as well as any other relevant
equitable considerations. The relative fault shall be determined by reference
to, among other things, whether the untrue or alleged untrue statement of a
material fact or the omission or alleged omission to state a material fact
relates to information supplied by the Company or the sellers of Registrable
Securities and the parties relative intent, knowledge, access to information
and opportunity to correct or prevent such untrue statement or omission. The
Company and the Holders agree that it would not be just and equitable if
contributions pursuant to this Section 6.4 were to be determined by pro rata
allocation (even if all Sellers of Registrable Securities were treated as one
entity for such purpose) or by any other method of allocation which does not
take account of the equitable considerations referred to in the first sentence
of this Section 6.4. The amount paid by an Indemnified Party as a result of
the expenses, claims, losses, damages or liabilities (or actions or proceedings
in respect thereof) referred to in the first sentence of this Section 6.4 shall
be deemed to include any legal or other expenses reasonably incurred by such
Indemnified Party in connection with investigating or defending any claim,
action or proceeding which is the subject of this Section 6.4. No person
guilty of fraudulent misrepresentation (within the meaning of Section 11(f) of
the Securities Act) shall be entitled to contribution from any person who was
not guilty of such fraudulent misrepresentation. The obligations of sellers of
Registrable Securities to contribute pursuant to this Section 6.4 shall be
several in proportion to the respective amount of Registrable Securities sold
by them pursuant to a registration statement. ARTICLE 7
RULE 144 REPORTING With a view to making available the benefits of certain rules and
regulations of the Commission which may at any time permit the sale of
securities of the Company to the public without registration, the Company
agrees to use its best efforts to: 7.1 Make and keep public information available as those terms are understood
and defined in Rule 144 under the Securities Act, at all times after the date
hereof; and 7.2 File with the Commission in a timely manner all reports and other documents
required of the Company under the Securities Act and the Exchange Act. ARTICLE 8 TRANSFER OF REGISTRATION RIGHTS The rights to cause the Company to register Registrable Securities under
this Agreement may be assigned by a Holder to Whitebox Advisors, LLC
(Whitebox") or to a transferee or assignee of Registrable Securities that (i)
is a subsidiary, parent or affiliated entity, general partner or limited
partner, member or retired partner or member of a Holder or of Whitebox, (ii)
is an affiliated fund, a follow-on fund or predecessor fund of a Holder or a
related fund or of Whitebox, (iii) is a Holders family member or trust for the
benefit of an individual Holder or (iv) acquires at least 50,000 shares of
Registrable Securities (as adjusted for stock splits, stock dividends, stock
combinations, reclassifications, recapitalizations, mergers, consolidations or
other similar events); provided, however, (A) the transferor shall, within ten
days before such transfer, furnish to the Company written notice of the name
and address of such transferee or assignee and the securities with respect to
which such registration rights are being assigned and (B) such transferee shall
agree in writing to be subject to all restrictions set forth in this Agreement.
In each case, such rights may only be transferred together with the underlying
Registrable Securities in a transfer permitted by the Securities Act and
applicable state securities laws. Any such transferee or assignee shall be
deemed a Holder hereunder. ARTICLE 9
LIMITATIONS ON REGISTRATION RIGHTS GRANTED TO OTHER SECURITIES




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From and after the date of this Agreement, the Company shall not without
the prior written consent of the holders of a majority of the Registrable
Securities then outstanding, enter into any agreement with any holder or
prospective holder of any securities of the Company providing for the grant to
such holder of registration rights superior to those granted herein. ARTICLE 10
MISCELLANEOUS 10.1 Governing Law. The laws of the state of Minnesota shall govern the
interpretation, validity and performance of the terms of this agreement,
regardless of the law that might be applied under principles of conflicts of
law. 10.2 Successors and Assigns. Except as otherwise expressly provided herein,
the provisions hereof shall inure to the benefit of, and be binding upon, the
successors, assigns, heirs, executors and administrators of the parties hereto. 10.3 Entire Agreement. This Agreement constitutes the full and entire
understanding and agreement between the parties with regard to the subject
matter hereof. 10.4 Termination. The obligations of the Company to register Registrable
Securities under this Agreement shall terminate on the tenth anniversary of the
date of this Agreement. In addition, the right of any Holder to request
inclusion in any registration under Article 3 shall terminate on the date
hereafter when (i) such Holder (together with its affiliates, partners, members
and former partners and members) holds less than 1% of the Companys
outstanding Common Stock and (ii) all Registrable Securities held by or
issuable to such Holder (and its affiliates, partners, members and former
partners and members) as payment under the Note, upon conversion of the Note or
upon exercise of the Warrant may be sold under Rule 144 during any 90 day
period. 10.5 Notices. All notices, requests, consents, and other communications
hereunder shall be in writing and shall be deemed effectively given and
received when delivered in person or by national overnight courier service or
by certified or registered mail, return receipt requested, or by telecopier,
addressed as follows: (a) if to the Company, at Entrx Corporation800 Nicollet Mall, Suite 2690Minneapolis, Minnesota 55402Attention: Wayne W. Mills, Chief Executive OfficerFacsimile: (612) 338-7332
 with a copy to:Felhaber, Larson, Fenlon &Vogt, P.A.601 Second Avenue South, Suite 4200Minneapolis, Minnesota 55402Attention: Roger H. Frommelt, Esq.Facsimile: (612) 338-4608
 (b) if to the Investor, in care of: Whitebox Advisors, LLC3033 Excelsior Boulevard, Suite 300




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Minneapolis, Minnesota 55416Attention: Jonathon Wood, Chief Financial OfficerFacsimile: (612) 253-6151with a copy to:Messerli & Kramer P.A.150 South Fifth Street, Suite 1800Minneapolis, Minnesota 55402Attention: Jeffrey C. Robbins, Esq.Facsimile: (612) 672-3777
 (c) if to any other Holder, to the address reflected on the records of the
Company, or such other address or addresses as shall have been furnished in
writing by such party to the Company and to the other parties to this
Agreement. 10.6 Severability. The invalidity, illegality or unenforceability of one or
more of the provisions of this Agreement in any jurisdiction shall not affect
the validity, legality or enforceability of the remainder of this Agreement in
such jurisdiction or the validity, legality or enforceability of this
Agreement, including any such provision, in any other jurisdiction, it being
intended that all rights and obligations of the parties hereunder shall be
enforceable to the fullest extent permitted by law. 10.7 Titles and Subtitles. The titles of the sections and subsections of this
Agreement are for convenience of reference only and are not to be considered in
construing this Agreement. 10.8 Counterparts. This Agreement may be executed in any number of
counterparts, each of which shall be an original, but all of which together
constitute one instrument. IN WITNESS WHEREOF, the parties hereto have caused this Agreement to be
executed and delivered by their respective duly authorized officers or
representatives as of the date first written above. ENTRX CORPORATIONBy:Wayne W. Mills, Chief Executive OfficerPANDORA SELECT PARTNERS L.P.By:Its: