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2177425
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Patent number 2,177,425
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Issue date Oct 24, 1939
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B29 - WORKING OF PLASTICS WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL
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1977207
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Patent number 1,977,207
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Issue date Oct 16, 1934
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B29 - WORKING OF PLASTICS WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL