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Photovoltaic cell
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Patent number 5,240,510
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Issue date Aug 31, 1993
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Development Products Inc.
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Victor A. Goldade
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H01 - BASIC ELECTRIC ELEMENTS
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Method of hardening metal surfaces
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Patent number 5,217,748
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Issue date Jun 8, 1993
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Development Products, Inc.
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Vladimir N. Kestelman
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C23 - COATING METALLIC MATERIAL COATING MATERIAL WITH METALLIC MATERIAL CHEMI...
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Optimum screw
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Patent number 5,195,631
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Issue date Mar 23, 1993
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Development Products, Inc.
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George K. Berman
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B65 - CONVEYING PACKING STORING HANDLING THIN OR FILAMENTARY MATERIAL