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Hydraulically dynamic mono-pig scraper
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Patent number 7,213,290
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Issue date May 8, 2007
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Durr Systems, Inc.
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Herbert Martin
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B05 - SPRAYING OR ATOMISING IN GENERAL APPLYING LIQUIDS OR OTHER FLUENT MATER...
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Duct-cleaning unit
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Patent number 6,249,927
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Issue date Jun 26, 2001
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Sumio Ando
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B08 - CLEANING
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Pipeline scraper
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Patent number 5,400,456
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Issue date Mar 28, 1995
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I.S.Y. Molchtechnik GmbH
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Hubert Skibowski
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B08 - CLEANING
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Pipeline pig
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Patent number 5,265,302
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Issue date Nov 30, 1993
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Orlande Sivacoe
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B08 - CLEANING
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Pipeline pig
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Patent number 5,150,493
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Issue date Sep 29, 1992
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Orlande Sivacoe
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B08 - CLEANING
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Pipeline scraper
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Patent number 5,127,125
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Issue date Jul 7, 1992
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I.S.T. Molchtechnik GmbH
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Hubert Skibowski
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B08 - CLEANING
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Driving device
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Patent number 4,442,674
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Issue date Apr 17, 1984
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Repa Feinstanzwerk GmbH
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Artur Fohl
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B60 - VEHICLES IN GENERAL
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3906576
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Patent number 3,906,576
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Issue date Sep 23, 1975
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B08 - CLEANING
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3857132
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Patent number 3,857,132
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Issue date Dec 31, 1974
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B08 - CLEANING
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3731701
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Patent number 3,731,701
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Issue date May 8, 1973
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B08 - CLEANING
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3704478
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Patent number 3,704,478
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Issue date Dec 5, 1972
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B08 - CLEANING
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3685083
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Patent number 3,685,083
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Issue date Aug 22, 1972
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B08 - CLEANING
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3667544
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Patent number 3,667,544
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Issue date Jun 6, 1972
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B08 - CLEANING
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3649983
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Patent number 3,649,983
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Issue date Mar 21, 1972
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B08 - CLEANING
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3530523
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Patent number 3,530,523
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Issue date Sep 29, 1970
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B08 - CLEANING
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3074436
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Patent number 3,074,436
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Issue date Jan 22, 1963
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B08 - CLEANING
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3073688
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Patent number 3,073,688
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Issue date Jan 15, 1963
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B08 - CLEANING
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3073687
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Patent number 3,073,687
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Issue date Jan 15, 1963
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B08 - CLEANING
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2575146
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Patent number 2,575,146
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Issue date Nov 13, 1951
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B08 - CLEANING
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2188959
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Patent number 2,188,959
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Issue date Feb 6, 1940
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B08 - CLEANING
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2087414
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Patent number 2,087,414
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Issue date Jul 20, 1937
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B08 - CLEANING
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1756378
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Patent number 1,756,378
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Issue date Apr 29, 1930
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B08 - CLEANING