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2837012
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Patent number 2,837,012
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Issue date Jun 3, 1958
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B31 - MAKING ARTICLES OF PAPER OR CARDBOARD WORKING PAPER OR CARDBOARD
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1882531
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Patent number 1,882,531
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Issue date Oct 11, 1932
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B31 - MAKING ARTICLES OF PAPER OR CARDBOARD WORKING PAPER OR CARDBOARD