Document:

EXHIBIT 10.1

                               SECOND AMENDMENT TO
                           LOAN AND SECURITY AGREEMENT

                  This Second Amendment to Loan and Security Agreement (the
"Second Amendment") is made as of March 31, 2005, between Congress Financial
Corporation (Central) ("Lender") and Fansteel Inc., a Delaware corporation
("Fansteel") and Wellman Dynamics Corporation, a Delaware corporation
("Wellman"; Fansteel and Wellman are collectively "Borrowers" and each
individually a "Borrower").

                                    RECITALS

                  WHEREAS, Borrowers and Lender are parties to that certain Loan
and Security Agreement dated January 23, 2004 (as the same has been amended,
supplemented or otherwise modified, the "Loan Agreement") and various other
documents, instruments and agreements (as amended, supplemented or otherwise
modified from time to time, the "Financing Agreements");

                  WHEREAS, Borrowers have requested that the Lender agree to
modify the minimum EBITDA covenant set forth in the Loan Agreement; and

                  WHEREAS, Lender has agreed to such request on and subject to
the terms and conditions hereof;

                  NOW THEREFORE, in consideration of the provisions set forth
herein, and for other good and valuable consideration, the receipt of which is
hereby acknowledged, the parties hereto agree as follows:

                  1. Defined Terms. Unless otherwise defined herein, capitalized
terms used herein shall have the same meanings herein as given to such terms in
the Loan Agreement.

                  2. Amendment to Loan Agreement. Subject to the satisfaction of
the conditions set forth herein, the Loan Agreement is amended as follows:

                  (a) Clause (a) of Section 9.17 of the Loan Agreement is
amended and restated in its entirety, as follows:

                  "(a) EBITDA Covenant.

                  Borrowers shall maintain EBITDA for each period set forth
below of at least the amount set forth opposite such period:

                                      -5-

                    Period                                           Amount
                    ------                                           ------
Six (6) months ended June 30, 2004                                 ($100,000)

Nine (9) months ended September 30, 2004                            $550,000

Twelve (12) months ended December 31, 2004                        $1,950,000

Twelve (12) months ended March 31, 2005 and the twelve (12)
months ended on the last day of each calendar quarter             $1,900,000"
thereafter

                  3. Condition. This Second Amendment shall be effective upon
its execution and delivery by all parties hereto.

                  4. Representations and Warranties. To induce the Lender to
enter into this Second Amendment, each Borrower hereby represents and warrants
to the Lender as follows:

                  (a) The execution, delivery and performance by such Borrower
of this Amendment and each of the other agreements, instruments and documents
contemplated hereby are within its power, have been duly authorized by all
necessary action, have received all necessary governmental approval (if any
shall be required), and do not and will not contravene or conflict with any
provision of law applicable to such Borrower, the organizational documents of
such Borrower, any order, judgment or decree of any court or governmental
agency, or any agreement, instrument or document binding upon such Borrower or
any of its property;

                  (b) Each of the Loan Agreement and the other Financing
Agreements, as amended by this Amendment, are the legal, valid and binding
obligation of such Borrower enforceable against such Borrower in accordance with
its terms, except as the enforcement thereof may be subject to (i) the effect of
any applicable bankruptcy, insolvency, reorganization, moratorium or similar
laws affecting creditor's rights generally, and (ii) general principles of
equity;

                  (c) The representations and warranties contained in the Loan
Agreement and the other Financing Agreements are true and accurate as of the
date hereof with the same force and effect as if such had been made on and as of
the date hereof, except to the extent that any such representation or warranty
expressly relates solely to an earlier date (in which case any such
representation or warranty shall be true and correct on and as of such earlier
date); and

                  (d) Such Borrower has performed all of its obligations under
the Loan Agreement and the Financing Agreements to be performed by it on or
before the date hereof and as of the date hereof, such Borrower is in compliance
with all applicable terms and provisions of the Loan Agreement, and each of the
Financing Agreements to be observed and performed by it, and no Default or Event
of Default is in existence.

                                      -6-

                  5. Miscellaneous.

                  (a) Expenses. Borrowers agree to pay, on demand, all costs and
expenses of Lender (including the fees and expenses of outside counsel for
Lender) in connection with the preparation, negotiation, execution, delivery and
administration of this Second Amendment and all other instruments or documents
provided for herein or delivered or to be delivered hereunder or in connection
herewith. All obligations provided in this Section 5(a) shall survive any
termination of the Loan Agreement as amended hereby.

                  (b) Governing Law. This Second Amendment shall be a contract
made under and governed by the internal laws of the State of Illinois.

                  (c) Counterparts. This Second Amendment may be executed in any
number of counterparts, and by the parties hereto on the same or separate
counterparts, and each such counterpart, when executed and delivered, shall be
deemed to be an original, but all such counterparts shall together constitute
but one and the same amendment.

                  (d) Successors. This Second Amendment shall be binding upon
Borrowers and Lender and their respective successors and assigns, and shall
inure to the benefit of Borrowers, Lender and their respective successors and
assigns.

                  (e) Ratification. Except as herein amended, the Loan Agreement
shall remain unchanged and in full force and effect, and is hereby ratified in
all respects.

                                      -7-

                  IN WITNESS WHEREOF, the parties hereto have caused this Second
Amendment to be executed by their respective officers thereunto duly authorized
and delivered at Chicago, Illinois as of the date first above written.

LENDER                                        BORROWERS
------                                        ---------

CONGRESS FINANCIAL CORPORATION (CENTRAL)      FANSTEEL INC.

By /S/ Barry Felker                           By /s/ R. Michael McEntee
-------------------                              ----------------------
Title Assistant Vice President                Title Vice President and Chief
------------------------------                Financial Officer

                                              WELLMAN DYNAMICS CORPORATION

                                              By /s/ R. Michael McEntee
                                                 ----------------------
                                              Title Vice President
                                              --------------------Dated March 29, 2005

                              AMENDED AND RESTATED

                                 LOAN AGREEMENT

                       AMENDED AND RESTATED LOAN AGREEMENT

                                     between

(1)    INVESTCORP TECHNOLOGIES VENTURES L.P., West Wind Building, P.O. Box 1111,
       Grand Cayman, Cayman Islands

                                         - hereinafter referred to as "LENDER" -

                                       and

(2)    WILLTEK COMMUNICATIONS GMBH, Gutenbergstra(beta)e 2 - 4, 85737 Ismaning

                                       - hereinafter referred to as "BORROWER" -

(3)    WIRELESS TELECOM GROUP INC., Parsippany, New Jersey

                                       - - hereinafter referred to as "PARENT" -

1      LOAN

       1.1    Lender shall make available to Borrower a loan in the principal
              amount of up to

              1.1.1  (euro)3,500,000 (in words: Euro three million five hundred
                     thousand), plus

              1.1.2  the interest accrued under the loan agreement of March 12,
                     2003 between the Borrower and the Lender, in the time
                     period ending on the closing of the envisaged sale of all
                     shares in the Borrower from the Lender and its
                     co-shareholder to the Parent as defined in the respective
                     Stock Purchase Agreement (hereinafter the "CLOSING");

              1.1.3  the Euro amount pursuant to Section 1.1.1 and 1.1.2 above,
                     shall be converted into USD at the exchange rate applicable
                     on the Closing.

              (hereinafter the "PRINCIPAL").

       1.2    The full Principal amount shall be lent by Lender to Borrower on
              the Closing.

       1.3    The purpose of the loan is to refinance the current EUR 3.5
              million face value loan plus accrued interest referred to in
              section 1.1.2 above.

2      INTEREST

       2.1    The amount of the Principal paid to Borrower shall bear simple
              interest in the amount of 4.0 % p.a., which shall be calculated on
              the basis of a 365-day year.

       2.2    The interest shall be payable upon repayment of the Principal as
              provided for in Section 3 below. The interest shall, however, be
              accrued at the end of each calendar quarter.

3      REPAYMENT

       3.1    The Principal and all accrued interest shall be repayable by
              Borrower to Lender on 31 December 2006 (such repayment hereinafter
              "REPAYMENT"):

              3.1.1

       3.2    The Repayment shall be made by wire transfer into the account of
              Lender listed below and shall be credited to the account on the
              due dates reflected in the repayment schedule. The Lender's
              account details are:

                      JPMORGAN CHASE BANK
                      4 Chase Metro Tech Center, 7th Floor
                      Brooklyn, NY 11245 USA
                      SWIFT ID (CHASUS33)
                      ABA number 021-000-021

                      For account of Investcorp Bank B.S.C.,
                      account no.544-7-07207
                      SWIFT ID (INVCBHBM)
                      for further credit to: Investcorp Technology Ventures L.P.

       3.3    Borrower is entitled to repay the entire outstanding amount of the
              Principal (including all accrued interest to date) without penalty
              at any time.

4      TERMINATION

       4.1    The Lender may terminate this loan in writing in case of an Event
              of Default as defined in Section 5 below at any time.

       4.2    The Lender may terminate this loan in writing with a four-week
              notice period:

              4.2.1  in case of a merger, acquisition, sale of voting control,
                     sale of substantially all of the assets of the Parent in
                     which the persons who at the date of this agreement are
                     shareholders of the Borrower (the "Shareholders") own less
                     than 15% of the outstanding shares of the surviving entity,
                     or in case of a sale or exclusive license of all or
                     substantially all of the Borrower's or the Parent's
                     intellectual property rights given that the Lender has not
                     expressed his prior consent to such transactions, or

              4.2.2  in case the Parent undertake a primary issuance of stock
                     with the net cash proceeds in excess of $15.0 million, or

              4.2.3  in case the Parent or any of its subsidiaries sell any
                     assets with a total net cash proceed in excess of $4.0
                     million,

              4.2.4  in case the Parent and its consolidated subsidiaries incur
                     or guarantee additional indebtedness not outstanding on the
                     date of this loan agreement or shall replace any
                     indebtedness in excess of $4.0 million, or

              4.2.5  in the case the Parent and its subsidiaries record a month
                     end cash and cash equivalent balance in excess of $18
                     million.

              4.2.6

       4.3    Upon a termination, the entire outstanding amount of the Principal
              (including interest) shall be due and payable by Borrower to
              Lender immediately without any further notice being required.

       4.4    Borrower shall, promptly and in any event within three business
              days of becoming aware of such event, give Lender written notice
              of any event that constitutes, or with the giving of notice or
              passage of time could constitute, a termination event or Event of
              Default hereunder.

       4.5    The Parent hereby guarantees payment of any amount payable by
              Borrower to the Lender hereunder.

5      EVENT OF DEFAULT

       For purposes of the this agreement, the following shall constitute an
       event of default (hereinafter "EVENT OF DEFAULT"):

       o      if Borrower does not make the Repayment as provided for in
              Sections 3.1, 3.2 or 4.3 above, or

       o      in case of a merger, acquisition, sale of voting control, sale of
              new shares, sale of substantially all of the assets of the Parent
              in which the Shareholders have voted against such transaction, or

       o      in case the Borrower or its Parent (or a creditor on behalf of
              Borrower or its Parent) is insolvent or files for bankruptcy,
              insolvency, composition or similar proceedings or any such
              proceeding is initiated or the application for
              bankruptcy/insolvency proceedings against the Borrower is rejected
              due to lack of assets, or

       o      in case Borrower or its Parent is in default under its existing
              bank arrangements and the banks either commence legal proceedings
              to enforce their claims against Borrower, or its Parent, or the
              banks start to realize and/or enforce the security granted by or
              on behalf of the Borrower or its Parent under the existing bank
              arrangements.

6      NO SET-OFF OR WITHHOLDING.

       Any rights of set-off or withholding (Aufrechnungs- oder
       Zuruckbehaltungsrechte) of the Borrower in relation to claims of the
       Lender under this Loan Agreement shall be excluded.

7      MISCELLANEOUS

       7.1    Borrower shall reimburse Lender for reasonable legal fees, due
              diligence costs and out-of-pocket expenses incurred in accordance
              with customary practice in connection with the conclusion of this
              Agreement, which fees, costs and expenses shall not exceed
              US$15,000.

       7.2    This Agreement shall be governed by German law.

       7.3    Changes and amendments to this Agreement shall be valid only if
              made in writing. This shall also apply to this Section 7.3.

       7.4    The courts of Frankfurt am Main shall have exclusive jurisdiction
              for all disputes out of or in connection with this Agreement.

       7.5    Neither this Agreement nor any rights and obligations hereunder
              may be assigned without the prior written approval of the Lender.

       7.6    This agreement is subject to the condition precedent that Closing
              has occurred.

       7.7    For the avoidance of doubt the parties confirm that there shall be
              no gross-up in case any withholding taxes are applicable to the
              payments provided for herein.

       7.8    The Lender, Borrower and Parent hereby acknowledge and agree that
              this Amended and Restated Loan Agreement amends and restates in
              its entirety that certain Loan Agreement among the Lender,
              Borrower and Parent dated October 5, 2004, and that such Loan
              Agreement shall have no further force or effect following the
              execution and delivery of this Amended and Restated Loan
              Agreement.

Munich/Parsippany, March 29, 2005

/s/ Mohammed Ameen, Director                         /s/ Cyrille Damany
------------------------------                       --------------------------
INVESTCORP TECHNOLOGY VENTURES, L.P.                 Willtek Communications GmbH
by ITV Limited, as General Partner of Investcorp
Technology Fund Limited Partnership, its General Partner

/s/ Paul Genova
-----------------------------
Wireless Telecom Group Inc.

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