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Coextruded plastic sheeting
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Patent number 4,221,836
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Issue date Sep 9, 1980
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Cosden Technology, Inc.,
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Raleigh N. Rutledge
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B29 - WORKING OF PLASTICS WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL
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Foamed profile extrusion process
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Patent number 3,931,379
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Issue date Jan 6, 1976
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Cosden Oil & Chemical Company
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Bob Joe Cruson
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B29 - WORKING OF PLASTICS WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL