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Sealing apparatus
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Issue date Oct 11, 1988
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Harold B. Siegel
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B29 - WORKING OF PLASTICS WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL
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3441461
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Patent number 3,441,461
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Patent number 3,262,829
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Issue date Jul 26, 1966
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B29 - WORKING OF PLASTICS WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL