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3336155
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Patent number 3,336,155
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Issue date Aug 15, 1967
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A61 - MEDICAL OR VETERINARY SCIENCE HYGIENE
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2237221
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Patent number 2,237,221
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Issue date Apr 1, 1941
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B29 - WORKING OF PLASTICS WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL
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1956564
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Patent number 1,956,564
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Issue date May 1, 1934
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B29 - WORKING OF PLASTICS WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL
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1811972
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Patent number 1,811,972
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Issue date Jun 30, 1931
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C08 - ORGANIC MACROMOLECULAR COMPOUNDS THEIR PREPARATION OR CHEMICAL WORKING-...