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3900943
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Patent number 3,900,943
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Issue date Aug 26, 1975
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C30 - CRYSTAL GROWTH
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3088435
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Patent number 3,088,435
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Issue date May 7, 1963
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E03 - WATER SUPPLY SEWERAGE
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3088852
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Patent number 3,088,852
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Issue date May 7, 1963
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E03 - WATER SUPPLY SEWERAGE
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2980560
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Patent number 2,980,560
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Issue date Apr 18, 1961
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H01 - BASIC ELECTRIC ELEMENTS