This application is a Divisional of Ser. No. 08/596,707, filed Feb. 5, 1996, now U.S. Pat. No. 5,807,437 which is a continuation of Ser. No. 08/019,470, filed Feb. 18, 1993, now abandoned.
This invention was made with government support under Grant Number 9215728-DDM awarded by the National Science Foundation. The government has certain rights in the invention.
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Number | Date | Country | |
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Parent | 596707 | Feb 1996 |
Number | Date | Country | |
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Parent | 019470 | Feb 1993 |