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2546868
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Patent number 2,546,868
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Issue date Mar 27, 1951
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B29 - WORKING OF PLASTICS WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL
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2421831
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Patent number 2,421,831
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Issue date Jun 10, 1947
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B29 - WORKING OF PLASTICS WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL
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2283316
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Patent number 2,283,316
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Issue date May 19, 1942
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B29 - WORKING OF PLASTICS WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL
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2271498
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Patent number 2,271,498
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Issue date Jan 27, 1942
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B29 - WORKING OF PLASTICS WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL
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2247337
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Patent number 2,247,337
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Issue date Jun 24, 1941
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B29 - WORKING OF PLASTICS WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL
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2140552
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Patent number 2,140,552
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Issue date Dec 20, 1938
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B29 - WORKING OF PLASTICS WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL
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1551110
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Patent number 1,551,110
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Issue date Aug 25, 1925
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B29 - WORKING OF PLASTICS WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL