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3567414
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Patent number 3,567,414
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Issue date Mar 2, 1971
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C03 - GLASS MINERAL OR SLAG WOOL
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3558295
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Patent number 3,558,295
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Issue date Jan 26, 1971
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B29 - WORKING OF PLASTICS WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL
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3437469
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Patent number 3,437,469
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Issue date Apr 8, 1969
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B65 - CONVEYING PACKING STORING HANDLING THIN OR FILAMENTARY MATERIAL