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3538732
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Patent number 3,538,732
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Issue date Nov 10, 1970
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B21 - MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL PUNCHING...
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3365791
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Patent number 3,365,791
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Issue date Jan 30, 1968
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B21 - MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL PUNCHING...
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3335596
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Patent number 3,335,596
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Issue date Aug 15, 1967
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B21 - MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL PUNCHING...
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2821727
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Patent number 2,821,727
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Issue date Feb 4, 1958
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B21 - MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL PUNCHING...
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2246578
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Patent number 2,246,578
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Issue date Jun 24, 1941
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B21 - MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL PUNCHING...