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3553545
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Patent number 3,553,545
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Issue date Jan 5, 1971
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H01 - BASIC ELECTRIC ELEMENTS
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3093629
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Patent number 3,093,629
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Issue date Jun 11, 1963
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C08 - ORGANIC MACROMOLECULAR COMPOUNDS THEIR PREPARATION OR CHEMICAL WORKING-...
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2972609
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Patent number 2,972,609
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Issue date Feb 21, 1961
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C08 - ORGANIC MACROMOLECULAR COMPOUNDS THEIR PREPARATION OR CHEMICAL WORKING-...
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2920256
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Patent number 2,920,256
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Issue date Jan 5, 1960
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H01 - BASIC ELECTRIC ELEMENTS