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3179390
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Patent number 3,179,390
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Issue date Apr 20, 1965
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B21 - MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL PUNCHING...
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3154298
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Patent number 3,154,298
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Issue date Oct 27, 1964
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B21 - MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL PUNCHING...