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2858571
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Issue date Nov 4, 1958
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2771777
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Patent number 2,771,777
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Issue date Nov 27, 1956
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Patent number 2,764,779
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2548974
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Patent number 2,548,974
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Issue date Apr 17, 1951
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B29 - WORKING OF PLASTICS WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL
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Patent number 2,197,087
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Issue date Apr 16, 1940
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B29 - WORKING OF PLASTICS WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL
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1983967
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Patent number 1,983,967
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Issue date Dec 11, 1934
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B29 - WORKING OF PLASTICS WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL