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3447994
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Patent number 3,447,994
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Issue date Jun 3, 1969
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B29 - WORKING OF PLASTICS WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL
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3433690
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Patent number 3,433,690
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Issue date Mar 18, 1969
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B29 - WORKING OF PLASTICS WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL
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3130100
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Patent number 3,130,100
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Issue date Apr 21, 1964
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B29 - WORKING OF PLASTICS WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL
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2956615
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Patent number 2,956,615
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Issue date Oct 18, 1960
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B29 - WORKING OF PLASTICS WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL
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2702070
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Patent number 2,702,070
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Issue date Feb 15, 1955
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B29 - WORKING OF PLASTICS WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL
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2487149
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Patent number 2,487,149
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Issue date Nov 8, 1949
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B29 - WORKING OF PLASTICS WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL