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2793941
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Patent number 2,793,941
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Issue date May 28, 1957
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C30 - CRYSTAL GROWTH
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2721209
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Patent number 2,721,209
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Issue date Oct 18, 1955
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C30 - CRYSTAL GROWTH
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2651566
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Patent number 2,651,566
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C30 - CRYSTAL GROWTH
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C30 - CRYSTAL GROWTH
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2562325
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C30 - CRYSTAL GROWTH
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2483647
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C30 - CRYSTAL GROWTH
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2204180
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C30 - CRYSTAL GROWTH
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1746144
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Patent number 1,746,144
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Issue date Feb 4, 1930
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C30 - CRYSTAL GROWTH