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3914521
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Patent number 3,914,521
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Issue date Oct 21, 1975
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B29 - WORKING OF PLASTICS WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL
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3462335
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Patent number 3,462,335
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Issue date Aug 19, 1969
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B29 - WORKING OF PLASTICS WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL