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3525161
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Patent number 3,525,161
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Issue date Aug 25, 1970
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F26 - DRYING
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3311993
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Patent number 3,311,993
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Issue date Apr 4, 1967
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B29 - WORKING OF PLASTICS WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL
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3256615
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Patent number 3,256,615
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Issue date Jun 21, 1966
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F26 - DRYING
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3193945
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Patent number 3,193,945
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Issue date Jul 13, 1965
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F26 - DRYING
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1690444
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Patent number 1,690,444
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Issue date Nov 6, 1928
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F26 - DRYING