Document:

EXHIBIT 4.11

                                 PROMISSORY NOTE

$12,400.97                                                  Date:  April 3, 2001

For value received, the undersigned  MariCulture Systems, Inc. (the "Borrower"),
at PO Box 968, Lake Stevens, Washington 98258-0968, promises to pay to the order
of Elaine  Louise  Meilahn,  (the  "Lender"),  at 7219 196th  Street  SW,  #C-3,
Lynnwood,  Washington  98036-4402,  (or at such  other  place as the  Lender may
designate in writing) the sum of $12,400.97 with interest calculated  separately
on the unpaid principal of each individual loan dating from each individual date
of inception, at the rate of 12.00% per annum.

The  individual  loans  that have  been made to the  Borrower  are  itemized  as
follows:

         $1,500.00 on 02/12/95.
         $2,765.00 on 11/17/97.
         $2,000.00 on 11/26/97.
         $  660.00 on 02/23/98.
         $2,475.97 on 03/10/98.
         $2,000.00 on 01/04/00.
         $1,000.00 on 01/28/00.

The unpaid principal and accrued interest shall be payable in full on any future
date on which the Lender demands repayment (the "Due Date").

All payments on this Note shall be applied first in payment of accrued  interest
and any remainder in payment of principal.

The Borrower  reserves the right to prepay this Note (in whole or in part) prior
to the Due Date with no prepayment penalty.

If any payment  obligation  under this Note is not paid when due,  the  Borrower
promises to pay all costs of  collection,  including  reasonable  attorney fees,
whether or not a lawsuit is commenced as part of the collection process.

If any  one or  more  of the  provisions  of  this  Note  are  determined  to be
unenforceable,  in whole or in part,  for any reason,  the remaining  provisions
shall remain fully operative.

All payments of  principal  and interest on this Note shall be paid in the legal
currency of the United  States.  The Borrower  waives  presentment  for payment,
protest, and notice of protest and nonpayment of this Note.

No renewal or extension of this Note, delay in enforcing any right of the Lender
under this Note, or assignment by Lender of this Note shall affect the liability
or the obligations of the Borrower. All rights of the Lender under this Note are
cumulative and may be exercised  concurrently or  consecutively  at the Lender's
option.

This  Note  shall be  construed  in  accordance  with  the laws of the  State of
Washington.

Signed this   _3rd_   day of   _April_  , _2001_ , at     _Lake Stevens_ , _WA_

Borrower:
MariCulture Systems, Inc.

By: /s/ David E.  Meilahn
------------------------------------------
     President<PAGE>   1
                                                                   EXHIBIT 10.18

THIS NOTE AND THE SECURITIES REPRESENTED HEREBY HAVE NOT BEEN REGISTERED UNDER
THE SECURITIES ACT OF 1933, AS AMENDED. THEY MAY NOT BE SOLD OR OFFERED FOR SALE
IN THE ABSENCE OF AN EFFECTIVE REGISTRATION STATEMENT AS TO THE SECURITIES UNDER
SAID ACT OR AN OPINION OF COUNSEL SATISFACTORY TO THE COMPANY THAT SUCH
REGISTRATION IS NOT REQUIRED.

                              COMPUTER MOTION, INC.

                                 PROMISSORY NOTE

$3,000,000                                                     December 12, 2000
                                                              Goleta, California

        FOR VALUE RECEIVED, Computer Motion, Inc., a Delaware corporation
("Company"), promises to pay to Robert Duggan (the "Holder"), the principal sum
of $3,000,000 together with interest from the date of this Note on the unpaid
principal balance at a rate equal to the Prime Rate, defined as appearing in the
Wall Street Journal or any other regularly published source selected by the
Company) per annum (the "Prime Rate"). The Prime Rate shall be determined on the
last day of each calendar month for use in calculating the interest which
accrues for the succeeding calendar month. All unpaid principal, together with
the balance of unpaid and accrued interest and other amounts payable hereunder,
shall be due and payable on demand.

The following is a statement of the rights of the Holder and the conditions to
which this Note is subject, and to which the Holder hereof, by the acceptance of
this Note, agrees

1. Collateral: The Promissory Note is secured by all the assets of Computer
Motion, Inc. except equipment financed under leasing agreements.

2. Default. The Company will be deemed to be in default hereunder and the unpaid
principal balance of this Note, together with all accrued interest thereon, will
become immediately due and payable on any default under this Note or the
Agreement, including without limitation, any breach of the covenants and
undertakings of the Company thereunder.

3. Successors and Assigns. The rights and obligations of Company and the Holder
of this Note shall be binding upon and benefit the successors, assigns, heirs,
administrators and transferees of the parties.

4. Waiver and Amendment. Any provision of this Note may be amended, waived or
modified upon the written consent of Company and the Holder.

5. Notices. Any notice, approval, request, authorization, direction or other
communication under this Note shall be given in writing and shall be deemed to
have been delivered and given for all purposes (i) on the delivery date if
delivered personally to the party to whom the same is directed or transmitted by
facsimile with confirmation of receipt, (ii) one (1) business day after deposit
with a commercial overnight carrier, with written verification of receipt, or
(iii) five (5) business days after the mailing date, whether or not actually
received, if sent by U.S. mail, return receipt requested, postage and charges
prepaid, at the address of the party set forth on the signature page of the
Agreement (or at such other address as may be communicated to the notifying
party in writing).

6. Payment. Payment shall be made in lawful tender of the United States.

7. Expenses. Proceeds of the note are subject to a 1.0% origination fee
($30,000) on the original loan which will be paid in January, 2001. If action is
instituted to collect this Note,

<PAGE>   2

Company promises to pay all costs and expenses, including, without limitation,
reasonable attorneys' fees and costs, incurred in connection with such action.

8. Governing Law. This Note and all actions arising out of or in connection with
this Note shall be governed by and construed in accordance with the laws of the
State of California, without regard to the conflicts of law provisions of the
State of California or of any other state.

9. Miscellaneous.

            (a) The Company hereby waives presentment, demand, protest, notice
of dishonor, diligence and all other notices, any release or discharge arising
from any extension of time, discharge of a prior party, release of any or all of
any security given from time to time for this Note, or other cause of release or
discharge other than actual payment in full hereof.

            (b) The Holder shall not be deemed, by any act or omission, to have
waived any of its rights or remedies hereunder unless such waiver is in writing
and signed by the Holder and then only to the extent specifically set forth in
such writing. A waiver with reference to one event shall not be construed as
continuing or as a bar to or waiver of any right or remedy as to a subsequent
event. No delay or omission of the Holder to exercise any right, whether before
or after a default hereunder, shall impair any such right or shall be construed
to be a waiver of any right or default, and the acceptance at any time by the
Holder of any past-due amount shall not be deemed to be a waiver of the right to
require prompt payment when due of any other amounts then or thereafter due and
payable.

            (c) Time is of the essence hereof. Upon any default hereunder, the
Holder may exercise all rights and remedies provided for herein and by law or
equity, including, but not limited to, the right to immediate payment in full of
this Note.

            (d) The remedies of the Holder as provided herein, or any one or
more of them, or in law or in equity, shall be cumulative and concurrent, and
may be pursued singularly, successively or together at the Holder sole
discretion, and may be exercised as often as occasion therefor shall occur.

            (e) The Company and the Holder intend to contract in compliance with
all state and federal usury laws governing this Note. The Company and the Holder
agree that none of the terms of the Agreement or this Note shall be construed as
a contract for, or requirement to pay interest at a rate in excess of, the
maximum interest rate allowed by any applicable state or federal usury laws. If
the Holder receives sums which constitute interest that would otherwise increase
the effective interest rate on the Note to a rate in excess of that permitted by
any applicable law, then all such sums constituting interest in excess of the
maximum lawful rate shall, at Holder's option, either be credited to the payment
of principal or returned to the Company.

        IN WITNESS WHEREOF, Company has caused this Note to be issued as of the
date first written above.

                                   COMPUTER MOTION, INC., a Delaware Corporation

                                       By:    /s/: Gordon L. Rogers
                                           -------------------------------------
                                            Gordon L. Rogers,
                                            Chief Financial Officer<PAGE>   1
                                                                  EXHIBIT 10.191

                                   DEMAND NOTE

$300,000.00                                                   New York, New York
                                                              January 5, 2001

        FOR VALUE RECEIVED, the undersigned, Wilshire Technologies, Inc. a
California corporation (hereinafter referred to as "Borrower"), hereby
unconditionally PROMISES TO PAY to the order to TRILON DOMINION PARTNERS, LLC, a
Delaware limited liability company ("Lender"), at 245 Park Avenue, 28th Floor,
New York, NY 10167, or at such other place as the holder of this Demand Note may
designate from time to time in writing, in lawful money of the United States of
America and in immediately available funds, the principal amount of Three
Hundred Thousand and 00/100, DOLLARS ($300,000.00), together with interest on
the unpaid principal amount of this Demand Note outstanding from time to time
from the date hereof, at a rate per annum equal to the Prime rate of interest
plus 3.0%, or the highest rate permitted by law, whichever shall be less.

        The principal amount of the indebtedness evidenced hereby shall be
payable on demand. Interest thereon shall be paid when principal is paid from
the date hereof until such principal amount is paid in full at such interest
rate as specified above. Following failure to pay on demand, Borrower agrees to
pay interest on any overdue payment of principal at a rate per annum equal to
the stated interest rate plus 5%, or the highest rate permitted by law,
whichever shall be less. All interest calculations shall be computed on the
basis of a 360 day year.

        Demand, presentment, protest and notice of nonpayment and protest are
hereby waived by Borrower.

        Borrower shall have no right to make any off-set against or deduct from
any payment due under this Demand Note.

        Principal and interest may be prepaid at any time without penalty.

        This Demand Note may not be changed orally, but only by an agreement in
writing and signed by the party against whom enforcement of such change is
sought.

        All covenants of Borrower in this Demand Note and all rights of the
holder under this Demand Note shall bind Borrower and its successors and
assigns, and all such covenants and rights shall inure to the benefit of the
holder of this Demand Note and its successors and assigns.

        This Demand Note has been delivered and accepted at New York, New York
and shall be interpreted, governed by, and construed in accordance with, the
laws of the State of New York.

                                      Wilshire Technologies, Inc.

                                      By:/s/ Kathleen Terry
                                         ------------------------------
                                      Name:  Kathleen E. Terry
                                      Title: Chief Financial Officer

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