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Human Waste System
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Publication number 20120000014
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Publication date Jan 5, 2012
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David R. Hall
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E03 - WATER SUPPLY SEWERAGE
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Chain Assembly
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Publication number 20100011628
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Publication date Jan 21, 2010
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David R. Hall
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E02 - HYDRAULIC ENGINEERING FOUNDATIONS SOIL SHIFTING
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System for reducing Oxygen
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Publication number 20090260369
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Publication date Oct 22, 2009
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David R. Hall
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F24 - HEATING RANGES VENTILATING
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Agitator in a Sewer System
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Publication number 20090236274
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Publication date Sep 24, 2009
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David R. Hall
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C02 - TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
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Sewer System
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Publication number 20090218264
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Publication date Sep 3, 2009
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David R. Hall
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E03 - WATER SUPPLY SEWERAGE
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Human Waste System
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Publication number 20090217448
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Publication date Sep 3, 2009
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David R. Hall
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E03 - WATER SUPPLY SEWERAGE
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Water Extraction Apparatus
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Publication number 20090183631
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Publication date Jul 23, 2009
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David R. Hall
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B01 - PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
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Inductive Power Coupler
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Publication number 20090151926
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Publication date Jun 18, 2009
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David R. Hall
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E21 - EARTH DRILLING MINING
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Retention System
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Publication number 20090146489
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Publication date Jun 11, 2009
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David R. Hall
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B28 - WORKING CEMENT, CLAY, OR STONE
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Retention System
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Publication number 20080246329
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Publication date Oct 9, 2008
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David R. Hall
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B28 - WORKING CEMENT, CLAY, OR STONE
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Retention System
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Publication number 20080238181
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Publication date Oct 2, 2008
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David R. Hall
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B28 - WORKING CEMENT, CLAY, OR STONE
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Impact Tool
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Publication number 20080129104
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Publication date Jun 5, 2008
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David R. Hall
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E21 - EARTH DRILLING MINING
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Rotary Shaft Impactor
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Publication number 20080121746
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Publication date May 29, 2008
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David R. Hall
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B02 - CRUSHING, PULVERISING, OR DISINTEGRATING PREPARATORY TREATMENT OF GRAIN...
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Impact Tool
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Publication number 20080115977
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Publication date May 22, 2008
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David R. Hall
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E21 - EARTH DRILLING MINING
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