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1433244
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Patent number 1,433,244
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Issue date Oct 24, 1922
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B21 - MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL PUNCHING...
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1351429
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Patent number 1,351,429
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Issue date Aug 31, 1920
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B21 - MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL PUNCHING...