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3868839
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Patent number 3,868,839
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Issue date Mar 4, 1975
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B21 - MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL PUNCHING...
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3845646
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Patent number 3,845,646
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Issue date Nov 5, 1974
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B21 - MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL PUNCHING...
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3600926
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Patent number 3,600,926
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Issue date Aug 24, 1971
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B21 - MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL PUNCHING...
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3513680
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Patent number 3,513,680
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Issue date May 26, 1970
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B21 - MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL PUNCHING...