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3458312
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Patent number 2,220,156
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Issue date Nov 5, 1940
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C08 - ORGANIC MACROMOLECULAR COMPOUNDS THEIR PREPARATION OR CHEMICAL WORKING-...
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1945315
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Patent number 1,945,315
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Patent number 1,928,492
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Patent number 1,910,338
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Issue date May 23, 1933
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