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3628366
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Patent number 3,628,366
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Issue date Dec 21, 1971
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B21 - MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL PUNCHING...
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1600068
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Patent number 1,600,068
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Issue date Sep 14, 1926
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B21 - MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL PUNCHING...
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1387909
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Patent number 1,387,909
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Issue date Aug 16, 1921
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B21 - MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL PUNCHING...
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1370998
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Patent number 1,370,998
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Issue date Mar 8, 1921
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B21 - MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL PUNCHING...