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2159329
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Patent number 2,159,329
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Issue date May 23, 1939
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B21 - MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL PUNCHING...
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1638902
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Patent number 1,638,902
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Issue date Aug 16, 1927
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B21 - MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL PUNCHING...
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1371469
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Patent number 1,371,469
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Issue date Mar 15, 1921
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B21 - MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL PUNCHING...
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1091415
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Patent number 1,091,415
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Issue date Mar 24, 1914
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B21 - MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL PUNCHING...