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                                                                   EXHIBIT 10.16

                                  BILL OF SALE

         FOR GOOD CONSIDERATION of Ten ($10.00) and other good an valuable
considerations, the receipt and sufficiency of which is hereby acknowledged,
and the agreement to assume legal liability for and make all payments and
fulfill all obligations under a promissory note in the amount of $9,000.00 USD,
bearing interest at 12%, and being payable in twenty four (24) monthly
installments of $390.00 with the first installment being due on 3/15/99,
payable to the order of WES ROBERTS, P. O. BOX 30, ARCHER CITY, TEXAS 76351,
the undersigned (Seller), hereby sells and transfers to Simpco, Inc., or
assigns, (Buyer), the following motor vehicles and personal property:

         One (1) 1977 Mack Truck, VIN R685ST65359, Texas Title No. 37715326;
and One (1) 1990 shopmade utility trailer, VIN TR169S51, Texas Title No.
29681480; and One (1) John Deer 410 backhoe.

         The Seller warrants it has good title to said property, full authority
to sell and transfer same, and that said property is, save & except this
assumed obligation, sold free of all liens, claims and encumbrances. Seller
warrants it will defend and indemnify Buyer from any adverse claims.

         Signed under seal this 15th day of March, 1999.

REGAL OPERATING CORPORATION         SIMPCO, INC.

By:   /S/ C. Y. SMITH               By:    /S/ RICHARD C. SMITH
   ------------------------             --------------------------
      C. Y. Smith                          Richard C. Smith<PAGE>   1
                                                                   EXHIBIT 10.17

                                 PROMISSORY NOTE

$45,000.00                        Boyd, Texas                     MARCH 18,1999

For value received, BASIC TECHNOLOGIES, INC. promises to pay to the order of
BOYD PARTNERS, LTD. In the City of Boyd, Wise County, Texas the sum of
FORTY-FIVE THOUSAND AND NO/100--------DOLLARS ($45,000.000) in legal and lawful
money of the United States of America, with interest thereon from the date
hereof until maturity at the rate of TEN percent (10%) per annum: the interest
payable monthly as it accrues; matured unpaid principal and interest shall bear
interest at the rate ten percent (10%) per annum from date of maturity until
paid.

This note is due and payable as follows, to wit: $45,000.00 PAYABLE IN 48 EQUAL
MONTHLY INSTALLMENTS OF $1,141.10 EACH PER MONTH, SUCH PAYMENT DUE ON OR BEFORE
THE 18TH DAY OF APRIL, 1999 AND A LIKE INSTALLMENT DUE ON OR BEFORE THE 18TH DAY
OF EACH MONTH THEREAFTER, UNTIL SAID NOTE IS FULLY PAID.

This note, to the extent of the amount herein mentioned, represents money this
day borrowed by the undersigned from the said BOYD PARTNERS, LTD., and to secure
the credit thus extended I/we have this day by said promissory note secured to
be paid the following:

It is expressly provided that upon default in the punctual payment of this note
or any part thereof, principal or interest, as the same shall become due and
payable, the entire indebtedness evidenced hereby shall be matured, at the
option of the holder. In the event this note, or any part hereof, is collected
through Probate, Bankruptcy or other judicial proceedings by an attorney or is
placed in the hands of an attorney for collection after maturity, then the
undersigned agree and promise to pay a reasonable attorney's fee for collection,
which in no event shall be less than ten percent (10%) of the principal and
interest then owing.

This note may be paid in whole or part at any time without penalty.

                                                        /s/ RICHARD C. SMITH
                                                        -----------------------
                                                        Basic Technologies, Inc.
                                                        By:  Richard C. Smith
                                                        Treasurer
                                                        1206 W. Main, Ste. 208
                                                        Lewisville, TX 75067
                                                        972-986-1654

                                                        -----------------------
                                                        Tax I.D. No.<PAGE>   1
                                                                   EXHIBIT 10.18

                                Promissory Note

$5,000.00                        Boyd, Texas                      March 18,1999

For value received, Basic Technologies, Inc. promises to pay to the order of
Pleasantview Partners, Ltd. in the City of Boyd, Wise County, Texas, the sum of
FIVE THOUSAND AND NO/100----DOLLARS ($5,000.00) in legal and lawful money of
the United States of America, with interest thereon from the date hereof until
maturity at the rate of ten percent (10%) per annum: the interest payable
monthly as it accrues; matured unpaid principal and interest shall bear
interest at the rate ten percent (10%) per annum from date of maturity until
paid.

This note is due and payable as follows, to wit: $5,000.00 payable in 48 equal
monthly installments of $126.80 each per month, such payment due on or before
the 18th day of April, 1999 and a like installment due on or before the 18th
day of each month thereafter, until said note is fully paid.

This note, to the extent of the amount herein mentioned, represents money this
day borrowed by the undersigned from the said Boyd Partners, Ltd., and to
secure the credit thus extended I/we have this day by said promissory note
secured to be paid the following:

It is expressly provided that upon default in the punctual payment of this note
or any part thereof, principal or interest, as the same shall become due and
payable, the entire indebtedness evidenced hereby shall be matured, at the
option of the holder. In the event this note, or any part hereof, is collected
through Probate, Bankruptcy or other judicial proceedings by an attorney or is
placed in the hands of an attorney for collection after maturity, then the
undersigned agree and promise to pay a reasonable attorney's fee for
collection, which in no event shall be less than ten percent (10%) of the
principal and interest then owing.

This note may be paid in whole or part at any time without penalty.

                                                      /s/  RICHARD C. SMITH
                                                      --------------------------
                                                      Basic Technologies, Inc.
                                                      By: Richard C. Smith
                                                      Treasurer
                                                      1206 W. Main, Ste. 208
                                                      Lewisville, TX 75067
                                                      972-986-1654

                                                      -------------------------
                                                      Tax I.D. No.<PAGE>   1
                                                                  EXHIBIT 10.19

                           PROMISSORY NOTE SECURED BY
                                 DEED OF TRUST

DATE:             March 19, 1999

MAKER:            Basic Technologies, Inc.

MAKER'S MAILING ADDRESS (INCLUDING COUNTY):

                  Basic Technologies, Inc.
                  1026 West Main Street, Suite 208
                  Lewisville, Dallas County, Texas 75067

PAYEE:            Wanda Ickert

PLACE FOR PAYMENTS (INCLUDING COUNTY):

                  1334 Highland
                  Olney, Young County, Texas 76374

PRINCIPAL AMOUNT:       $11,500.00

ANNUAL INTEREST RATE ON UNPAID PRINCIPAL FROM DATE OF FUNDING:

             10.0%

ANNUAL INTEREST RATE ON MATHRED, UNPAID AMOUNTS:

             10.0%

TERMS OF PAYMENT:

            Principal and interest shall be due and payable in monthly
            installments of Two Hundred Forty-Five and 21/100 Dollars ($245.21)
            (or more) each, payable on the 1st day of each and every calendar
            month, beginning May 1, 1999, and continuing regularly and monthly
            thereafter until April 1, 2004, when the entire balance of
            principal and accrued interest shall be due and payable, interest
            being calculated on the unpaid principal to the date of each
            installment paid and the payment made credited first to the
            discharge of the interest accrued and the balance to the reduction
            of the principal.

SECURITY FOR PAYMENT:

             Secured by a deed of trust of even date herewith executed by Maker
to W. W. Price, Jr., Trustee, covering real property located in Young County,
Texas, as more particularly described in said deed of trust.

             Maker promises to pay to the order of Payee at the place for
payment and according to the terms of payment the principal amount plus
interest at the rates stated above. All unpaid amounts shall be due by the
final scheduled payment date.

             On default in the payment of this note or in the performance of
any obligation in any instrument securing or collateral to it, the unpaid
principal balance and earned interest on this note shall become immediately due
at the election of Payee. Maker and each surety, endorser, and guarantor waive
all demands for payment, presentations for payment, notices of intention to
accelerate maturity, notices of acceleration of maturity, protests, and notice
of protest.
             If this note or any instrument securing or collateral to it is
given to an attorney for collection or enforcement, or if suit is brought for
collection or enforcement, or if it is collected or enforced through probate,
bankruptcy, or other judicial proceeding, then Maker shall pay Payee all costs
of collection and enforcement, including reasonable attorney's fees and court
costs, in addition to other amounts due. Reasonable attorney's fees shall be
10% of all amounts due unless either party pleads otherwise.

<PAGE>   2

             Interest on the debt evidence by this note shall not exceed the
maximum amount of nonusurious interest that may be contracted for, taken,
reserved, charged, or received under law; any interest in excess of that
maximum amount shall be credited on the principal of the debt or, if that has
been paid, refunded. On any acceleration or required or permitted prepayment,
any such excess shall be canceled automatically as of the acceleration or
prepayment or, if already paid, credited on the principal of the debt or, if
the principal of the debt has been paid, refunded. This provision overrides
other provisions in this and all other instruments concerning the debt.

             Each Maker is responsible for all obligations represented by this
note.

             When the context requires, singular nouns and pronouns include the
plural.

                                         BASIC TECHNOLOGIES, INC.

                                         By: /s/ BRYAN WALKER
                                            ------------------------------
                                                 Bryan Walker, President

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