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Forming tool for multiple-thickness blanks
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Patent number 7,320,239
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Issue date Jan 22, 2008
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GM Global Technology Operations, Inc.
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Gary A. Kruger
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B21 - MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL PUNCHING...
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3238610
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Patent number 3,238,610
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Issue date Mar 8, 1966
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B21 - MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL PUNCHING...
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2912951
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Patent number 2,912,951
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Issue date Nov 17, 1959
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B21 - MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL PUNCHING...
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2761206
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Patent number 2,761,206
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Issue date Sep 4, 1956
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B21 - MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL PUNCHING...