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Dragboard assembly
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Patent number 5,722,577
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Issue date Mar 3, 1998
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Armstrong/Kover Kwick, Inc.
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Lloyd Simpson
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B21 - MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL PUNCHING...
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5364330
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Patent number 5,364,330
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Issue date Nov 15, 1994
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B23 - MACHINE TOOLS METAL-WORKING NOT OTHERWISE PROVIDED FOR
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3703449
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Patent number 3,703,449
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Issue date Nov 21, 1972
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B21 - MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL PUNCHING...
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3601837
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Patent number 3,601,837
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Issue date Aug 31, 1971
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B08 - CLEANING
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3245102
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Patent number 3,245,102
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Issue date Apr 12, 1966
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B08 - CLEANING