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Quick action bar clamp
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Patent number 5,222,420
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Issue date Jun 29, 1993
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Petersen Manufacturing Co., Inc.
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Joseph A. Sorensen
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B25 - HAND TOOLS PORTABLE POWER-DRIVEN TOOLS MANIPULATORS
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Quick action bar clamp/spreader
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Patent number D333602
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Issue date Mar 2, 1993
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Petersen Manufacturing Co., Inc.
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Dwight L. Gatzemeyer
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D08 - Tools and hardware
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Quick action bar clamp
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Patent number 5,170,682
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Issue date Dec 15, 1992
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Petersen Manufacturing Co., Inc.
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Joseph A. Sorensen
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B25 - HAND TOOLS PORTABLE POWER-DRIVEN TOOLS MANIPULATORS
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Bar clamp
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Patent number D328846
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Issue date Aug 25, 1992
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Petersen Manufacturing Co., Inc.
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Joseph A. Sorensen
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D08 - Tools and hardware
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Hand tool or improved bar clamp
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Patent number 5,094,131
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Issue date Mar 10, 1992
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Petersen Manufacturing Co., Inc.
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Joseph A. Sorensen
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B25 - HAND TOOLS PORTABLE POWER-DRIVEN TOOLS MANIPULATORS
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Quick-action bar clamp
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Patent number 5,009,134
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Issue date Apr 23, 1991
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Petersen Manufacturing Co., Inc.
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Joseph A. Sorensen
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B25 - HAND TOOLS PORTABLE POWER-DRIVEN TOOLS MANIPULATORS
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Hand tool or improved bar clamp
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Patent number 5,005,449
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Issue date Apr 9, 1991
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Peterson Manufacturing Co., Inc.
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Joseph A. Sorensen
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B25 - HAND TOOLS PORTABLE POWER-DRIVEN TOOLS MANIPULATORS
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Quick-action bar clamp
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Patent number 4,926,722
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Issue date May 22, 1990
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Petersen Manufacturing Co., Inc.
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Joseph A. Sorensen
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B25 - HAND TOOLS PORTABLE POWER-DRIVEN TOOLS MANIPULATORS