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Water main scraper
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Patent number 4,912,799
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Issue date Apr 3, 1990
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Lewis E. Coleman
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B08 - CLEANING
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Pipe scraping tool
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Patent number 4,750,249
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Issue date Jun 14, 1988
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Henry A. Richardson
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B23 - MACHINE TOOLS METAL-WORKING NOT OTHERWISE PROVIDED FOR
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3343986
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Patent number 3,343,986
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Issue date Sep 26, 1967
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B08 - CLEANING
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3214824
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Patent number 3,214,824
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Issue date Nov 2, 1965
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B23 - MACHINE TOOLS METAL-WORKING NOT OTHERWISE PROVIDED FOR
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3128083
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Patent number 3,128,083
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Issue date Apr 7, 1964
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B01 - PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
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2766469
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Patent number 2,766,469
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Issue date Oct 16, 1956
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B08 - CLEANING
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2713011
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Patent number 2,713,011
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Issue date Jul 12, 1955
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B21 - MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL PUNCHING...
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2361660
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Patent number 2,361,660
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Issue date Oct 31, 1944
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B08 - CLEANING
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2234153
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Patent number 2,234,153
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Issue date Mar 4, 1941
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B21 - MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL PUNCHING...
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2181306
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Patent number 2,181,306
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Issue date Nov 28, 1939
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B08 - CLEANING