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3178496
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Patent number 3,178,496
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Issue date Apr 13, 1965
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B29 - WORKING OF PLASTICS WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL
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3175249
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Patent number 3,175,249
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Issue date Mar 30, 1965
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B29 - WORKING OF PLASTICS WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL
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2684502
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Patent number 2,684,502
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Issue date Jul 27, 1954
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B29 - WORKING OF PLASTICS WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL