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HyperBaric Systems 1127 Harker Avenue Palo Alto, CA 94301 UNSECURED PROMISSORY NOTE May 22, 2000 HyperBaric Systems (Company), a California Corporation, does hereby promise to pay Harry Masuda an amount of $5,000, for sums loaned the Company this date. The principal amount plus any unpaid interest earned at 10% per annum is due upon demand. This note is unsecured. HyperBaric Systems /s/ Ardeth Sealy ______________________ Ardeth Sealy Chief Financial Officer, Secretary
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