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3823594
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Patent number 3,823,594
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Issue date Jul 16, 1974
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B21 - MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL PUNCHING...
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3735622
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Patent number 3,735,622
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Issue date May 29, 1973
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B21 - MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL PUNCHING...
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2025439
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Patent number 2,025,439
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Issue date Dec 24, 1935
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B21 - MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL PUNCHING...
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1113383
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Patent number 1,113,383
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Issue date Oct 13, 1914
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B21 - MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL PUNCHING...
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394635
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Patent number 394,635
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Issue date Dec 18, 1888
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B21 - MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL PUNCHING...
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325938
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Patent number 325,938
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Issue date Sep 8, 1885
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B21 - MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL PUNCHING...
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311477
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Patent number 311,477
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Issue date Feb 3, 1885
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B21 - MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL PUNCHING...