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3928108
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Patent number 3,928,108
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Issue date Dec 23, 1975
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B32 - LAYERED PRODUCTS
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3922416
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Patent number 3,922,416
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Issue date Nov 25, 1975
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G03 - PHOTOGRAPHY CINEMATOGRAPHY ELECTROGRAPHY HOLOGRAPHY
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3778361
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Patent number 3,778,361
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Issue date Dec 11, 1973
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B29 - WORKING OF PLASTICS WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL