Document:

EXHIBIT 10-b

                         CITIZENS BANK OF MASSACHUSETTS

                              REVOLVING DEMAND NOTE

$800,000.00                                                       July    , 2003
                                                           Boston, Massachusetts

      For value received, the undersigned, Vulcan Industries, Inc., a Michigan
corporation (the "Borrower"), hereby promises to pay ON DEMAND, and if demand is
not sooner made, then as provided in the Loan Agreement (defined below), to the
order of Citizens Bank of Massachusetts, a Massachusetts bank (the "Bank"), at
its main office in Boston, Massachusetts, or at any other place designated at
any time by the holder hereof, in lawful money of the United States of America
and in immediately available funds, the principal sum of Eight Hundred Thousand
($800,000.00) Dollars or, if less, the aggregate unpaid principal amount of all
loans made by Bank to Borrower under the Loan Agreement, together with interest
on the principal amount hereunder remaining unpaid from time to time, computed
on the basis of the actual number of days elapsed and a 360-day year, from the
date hereof until this Note is fully paid at the rate from time to time in
effect under the Demand Loan and Security Agreement (All Assets) of even date
herewith (the "Loan Agreement") by and between Bank and Borrower. The principal
hereof and interest accruing thereon shall be due and payable as provided in the
Loan Agreement.

      This Note may be prepaid in whole or in part at any time and from time to
time without premium or penalty.

      This Note is issued pursuant, and is subject, to the Loan Agreement, which
provides, among other things, for acceleration hereof. This Note is the "Note"
referred to in the Loan Agreement.

      This Note is secured, among other things, pursuant to the Loan Agreement,
and may now or hereafter be secured by one or more other security agreements,
mortgages, deeds of trust, assignments or other instruments or agreements.

      Borrower hereby agrees to pay all costs of collection, including
attorneys' fees and legal expenses in the event this Note is not paid when due,
whether or not legal proceedings are commenced.

      Presentment or other demand for payment, notice of dishonor and protest
are expressly waived.

      All rights and obligations hereunder shall be governed by the laws of the
Commonwealth of Massachusetts and this Note shall be deemed to be under seal.

                                             VULCAN INDUSTRIES, INC.

                                By:_____________________________________________
                                    Robert I. Lieberman, President and TreasurerEXHIBIT 10-c

Wells Fargo Equipment Finance, Inc.                    Interim Funding Agreement
733 Marquette Avenue, Suite 700
MAC N9306-070
Minneapolis, MN  55402
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This agreement is dated as of July 25, 2003 by and between Wells Fargo Equipment
Finance, Inc.("Creditor") and the undersigned lessee or purchaser or borrower
from Creditor, as the case may be (the "Customer").

WHEREAS Creditor has agreed to finance certain equipment for the Customer by way
of lease, installment date contract or promissory note (the "Contract", such
equipment being described as follows (the "Equipment"):

See Schedule A

WHEREAS the vendor or vendors of the Equipment require progress payments to be
made.

NOW THEREFORE the parties hereby agree as follows:

      1.    Creditor agrees to make progress payments to the vendor or vendors
            of the Equipment subject to the terms of this Agreement.

      2.    The aggregate amount advanced by Creditor hereunder shall not exceed
            $1,575,000.00, and Creditor shall not advance and progress payment
            hereunder without the prior written authorization of the Customer.

      3.    Creditor shall not advance any progress payment hereunder until it
            shall have first received the following: (a) the Contract duly
            signed by the Customer and all other related documentation that can
            be delivered prior to the Customer's acceptance of the Equipment,
            and (b) all advance payments and security deposits required by the
            Contract.

      4.    The term "Cutoff Date" as used in this Agreement means the earliest
            to occur of the following dates: (a) 12/31/03, (b) the date there
            occurs an Event of Default as defined in the Contract
            (notwithstanding that the Equipment has not then been delivered and
            accepted); or (c) the date there occurs a material adverse change in
            the financial condition, business, or prospects of the Customer from
            that considered by Creditor in making its decision to finance the
            Equipment.

      5.    If on the Cutoff Date the Equipment has not been delivered to and
            accepted by the Customer under the Contract as evidenced by a
            delivery and acceptance certificate executed by the Customer in form
            and substance satisfactory to Creditor, then upon demand at any time
            after the Cutoff Date the Customer shall pay Creditor the total
            amount advanced hereunder and remaining unpaid on the Cutoff Date
            together with accrued but unpaid interest thereon determined as
            provided below, and Creditor shall no longer be obligated to make
            advances hereunder. Upon such payment, Creditor shall transfer all
            of its rights, title, and interest in the Equipment and in progress
            payments advanced hereunder to the Customer without recourse or any
            warranty whatsoever. In order to protect its ability to acquire use
            of the Equipment, the Customer may, if Creditor has not demanded
            payment with 10 business days after the specific date set forth in
            clause (a) of the definition of Cutoff Date, pay Creditor within
            such period the amount that would have even due had such a demand
            been made, but if no such payment is made within such period, the
            Customer shall have no right to acquire use of the Equipment under
            the Contract, and Creditor may, at its option, by written notice to
            the Customer, declare the Contract and all of Creditor's obligations
            thereunder terminated and acquire the Equipment for its own account
            or make any other arrangement with the vendor it can negotiate or
            demand payment from the Customer as provided above.

      6.    Whether or not the Equipment is accepted by the Customer under the
            Contract, the Customer agrees to pay Creditor interest on the unpaid
            balance of the amount advanced hereunder for the date of the initial
            advance until the advances are fully paid at an annual rate
            (computed on the basis of actual days elapsed in a 360-day year)
            equal to the following: 1% above the rate of interest publicly
            announced by Wells Fargo Bank Minnesota, National Association from
            time to time as its base rate, each change in the interest rate
            hereon to become effective.

      7.    Interest shall be payable monthly beginning with the 10th day of the
            month following the month in which the first advance is made and on
            the same day of each month thereafter and also on the maturity date.
            The maturity date of this obligation is the earliest of (a) the date
            Creditor demands payment pursuant to paragraph 5, (b) the date the
            Equipment is accepted by the Customer under the Contract, or (c) the
            date the Customer prepays as permitted by paragraph 5.

      8.    Some items of Equipment may be delivered by the vendor to the
            Customer without the Customer having accepted the items under the
            Contract. The Customer agrees to maintain insurance of each item of
            Equipment as required by the Contract from the date it is delivered
            to the Customer regardless of whether the Customer has accepted the
            item under the Contract.

      9.    Although the Customer has agreed to reimburse Creditor as provided
            in paragraph 5 for amounts advanced by Creditor hereunder, such
            amounts do not constitute loans to the Customer, and Creditor as the
            party making the progress payments to the vendor or vendors reserves
            for its own benefit all rights to the Equipment and to the benefits
            of amounts advanced hereunder subject only to its obligations under
            the Contract and under the Agreement.

      10.   Creditor makes no representation as to when the Equipment may be
            delivered by the vendor thereof.

      11.   This agreement may not be assigned by the Customer without the prior
            written consent of Creditor. This agreement shall be binding upon
            and inure to the benefit of the successors and assigns of the
            parties hereto.

      12.   This agreement shall be governed by the same substantive laws that
            govern the Contract.

Creditor:  Wells Fargo Equipment Finance, Inc.

_____________________________________       See attached Annex A for Signatures
By

_____________________________________
Title

<PAGE>

Wells Fargo Equipment Finance, Inc.                                      Annex A
Investors Building, Suite 300
733 Marquette Avenue
Minneapolis, MN  55402
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           Annex A to Interim Funding Agreement dated as of 7/25/2003

W By signing this agreement, each of the undersigned acknowledges that they are
jointly and severally bound to perform all of the obligation of the Debtor under
the note and the term "Debtor" shall refer to each of them separately and to all
of the jointly.

In witness whereof, Debtor and Secured Party, intending to be legally bound
hereby, have duly executed this Agreement, as of the day and year first
aforesaid.

Debtor: Thermodynetics, Inc.

By:____________________________________

Title:_________________________________

Debtor: Vulcan Industries, Inc.

By:____________________________________

Title:_________________________________

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