Exhibit 10.237

                                 EXHIBIT 10.237

                                 PROMISSORY NOTE
                                                            Glendale, California

$200,000                                                            June 7, 2000

     FOR VALUE RECEIVED, the undersigned, Pollution Research and Control Corp.,
a California corporation (hereinafter referred to as the "Maker"), with its
address at 506 Paula Avenue, Glendale, California 91201, agrees and promises to
pay to the order of Delta Capital Partners, a corporation (hereinafter referred
to as the "Holder"), at 9300 Wilshire Boulevard, Suite 308, Beverly Hills, Ca
90212, or such other place as the Holder may designate in writing, in coin or
currency of the United States of America, which at the time of payment is legal
tender for the payment of public and private debts, the principal sum of two
hundred thousand dollars ($200,000), together with interest thereon at the rate
of eighteen per cent ("18% ") per annum, from the date hereof until maturity, as
hereinafter provided. The principal balance of this Promissory Note (hereinafter
referred to as the "Note"), together with all interest then accrued and unpaid,
shall be due and payable on the first to occur of the following dates: (i) June
28, 2000, or (ii) the date upon whichMaker receives financing in the amount of
at least $300,000.

     As an incentive to the Holder to make the loan to the Maker described in
this Note, the Maker shall grant to the Holder, contemporaneously with the
execution of this Note, an option of even date herewith, a copy of which is
attached hereto and incorporated herein by this reference, exercisable to
purchase 15,000 restricted shares of Common Stock of the Company at an exercise
price of $2.25 per share on or prior to 5:00 p.m. Los Angeles time, on June 6,
2003.

     The Maker may prepay any part or all of this Note at any time without
penalty. Each payment or pre-payment made by the Maker hereunder shall be
applied first to the payment or pre-payment of accrued and unpaid interest, if
any, due on the unpaid principal balance of this Note and the remainder of each
payment or pre-payment made by the Maker shall be applied to the reduction of
the unpaid principal balance hereof.

     If default is made in the payment of this Note, as and when the same is or
becomes due, the Holder may, after notice and failure to cure as hereinafter
provided, without additional notice or demand, declare the entire unpaid
principal balance hereof and accrued and unpaid interest, if any, at once due
and payable.

     Except as otherwise specifically set out herein, the Maker waives demand
and presentment for payment, notice of non-payment, protest, notice of protest,
notice of acceleration of the indebtedness due hereunder, bringing of suit and
diligence in taking any action to collect amounts called for hereunder, and
agrees that the time of payments hereof may be extended without notice at any
time and from time-to-time, and for periods of time for a term or terms in
excess of the original term without notice or consideration to, or consent from
the Maker, without same constituting a waiver of the Holder's rights under this
Note.

                                       1

<PAGE>


     If payment hereunder is not made when due or in the event of default in any
other covenant, condition or promise under this Note, the Holder may at his
electionate this Note. Form and after the date of such default, the principal
sum and all interest then accrued shall bear interest at the rate of twenty
percent (20%) per annum until paid.

     If the entire outstanding principal balance becomes due, the Maker agrees
to pay the Holder's reasonable costs (including reasonable attorney's fees and
court costs) in collecting on this Note, including the reasonable costs of
obtaining and enforcing a judgment for any balance due on this Note.

     This Note has been executed in the City identified in the heading and
delivered to the Holder at the address stated herein. It is to be performed, in
whole or in part, in the State of California, and the laws of such state shall
govern the validity, construction, enforcement and interpretation of this Note.
Jurisdiction and venue for any action hereunder shall be in the County of the
City identified in the heading.

     The Maker represents that it is duly authorized and empowered to enter
into, deliver, perform and be fully bound by all of the terms, provisions and
conditions of this Note. The Maker also represents that the making and delivery
of this Note, and the performance of any agreement or instrument made in
connection herewith, does not conflict with or violate any other agreement to
which the Maker is a party.

     No provision of this Note shall require the payment or permit the
collection of interest in excess of the maximum permitted by law, and in the
event of any such excess, neither the Maker nor its successors or assigns shall
be obligated to pay any such excess to the extent that it is more than the
amount permitted by law. If an excess amount is received, charged, collected or
applied as interest, it shall automatically be made so as to reduce the rate to
that permitted by law and any excess interest then received, charged or
collected shall be applied to reduce the amount of any collateral to which the
Holder is entitled.

     In the event that any word, phrase, clause, sentence or other provision
hereof shall violate any applicable statute, ordinance or rule of law in any
jurisdiction in which it is used, such provision shall be ineffective to the
extent of such violation without invalidating any other provision hereof.

     IN WITNESS HEREOF, this Note is executed on the date and year above
written.

                                            POLLUTION RESEARCH AND CONTROL CORP.


                                            By:  /s/  Albert E. Gosselin
                                               --------------------------------
                                                      Albert E. Gosselin, Jr.,
                                                      President

                                       2