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3832240
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Patent number 3,832,240
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Issue date Aug 27, 1974
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B21 - MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL PUNCHING...
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3587273
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Patent number 3,587,273
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Issue date Jun 28, 1971
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B21 - MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL PUNCHING...
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3465567
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Patent number 3,465,567
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Issue date Sep 9, 1969
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B21 - MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL PUNCHING...
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1920275
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Patent number 1,920,275
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Issue date Aug 1, 1933
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B21 - MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL PUNCHING...
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1762835
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Patent number 1,762,835
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Issue date Jun 10, 1930
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B21 - MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL PUNCHING...
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1634661
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Patent number 1,634,661
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Issue date Jul 5, 1927
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B21 - MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL PUNCHING...
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1550587
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Patent number 1,550,587
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Issue date Aug 18, 1925
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B21 - MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL PUNCHING...