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3659975
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Patent number 3,659,975
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Issue date May 2, 1972
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B29 - WORKING OF PLASTICS WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL
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2834984
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Patent number 2,834,984
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Issue date May 20, 1958
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B29 - WORKING OF PLASTICS WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL
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Patent number 2,571,258
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Issue date Oct 16, 1951
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B29 - WORKING OF PLASTICS WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL
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2025992
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Patent number 2,025,992
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Issue date Dec 31, 1935
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B29 - WORKING OF PLASTICS WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL
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2025993
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Patent number 2,025,993
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Issue date Dec 31, 1935
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B29 - WORKING OF PLASTICS WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL
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1681973
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Patent number 1,681,973
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Issue date Aug 28, 1928
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B29 - WORKING OF PLASTICS WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL