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3204393
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Patent number 3,204,393
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Issue date Sep 7, 1965
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B21 - MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL PUNCHING...
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3069942
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Patent number 3,069,942
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Issue date Dec 25, 1962
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B21 - MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL PUNCHING...