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Wallace R. Birtch
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Menomonee Falls, WI, US
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Patent Grant
Hydroformed tubular member and method of hydroforming tubular members
Patent number
6,216,509
Issue date
Apr 17, 2001
R.J. Tower Corporation
Steven R. Lotspaih
B21 - MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL PUNCHING...