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Earth working sweep
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Patent number 6,508,147
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Issue date Jan 21, 2003
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Douglas G. Bruce
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A01 - AGRICULTURE FORESTRY ANIMAL HUSBANDRY HUNTING TRAPPING FISHING
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Method of making a bentleg plow
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Patent number 4,999,893
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Issue date Mar 19, 1991
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Governors of the University of Alberta
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H. Page Harrison
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E02 - HYDRAULIC ENGINEERING FOUNDATIONS SOIL SHIFTING
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3500534
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Patent number 3,500,534
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Issue date Mar 17, 1970
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H01 - BASIC ELECTRIC ELEMENTS
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3213514
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Patent number 3,213,514
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Issue date Oct 26, 1965
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B21 - MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL PUNCHING...
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3166826
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Patent number 3,166,826
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Issue date Jan 26, 1965
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B21 - MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL PUNCHING...
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3083440
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Patent number 3,083,440
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Issue date Apr 2, 1963
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B21 - MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL PUNCHING...
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2970374
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Patent number 2,970,374
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Issue date Feb 7, 1961
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A01 - AGRICULTURE FORESTRY ANIMAL HUSBANDRY HUNTING TRAPPING FISHING
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2952895
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Patent number 2,952,895
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Issue date Sep 20, 1960
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B21 - MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL PUNCHING...
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2778126
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Patent number 2,778,126
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Issue date Jan 22, 1957
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E01 - CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
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2760253
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Patent number 2,760,253
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Issue date Aug 28, 1956
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B21 - MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL PUNCHING...
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2733500
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Patent number 2,733,500
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Issue date Feb 7, 1956
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B21 - MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL PUNCHING...
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2705534
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Patent number 2,705,534
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Issue date Apr 5, 1955
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B23 - MACHINE TOOLS METAL-WORKING NOT OTHERWISE PROVIDED FOR
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2705448
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Patent number 2,705,448
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Issue date Apr 5, 1955
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B23 - MACHINE TOOLS METAL-WORKING NOT OTHERWISE PROVIDED FOR
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2662268
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Patent number 2,662,268
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Issue date Dec 15, 1953
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B21 - MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL PUNCHING...
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2659332
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Patent number 2,659,332
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Issue date Nov 17, 1953
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B23 - MACHINE TOOLS METAL-WORKING NOT OTHERWISE PROVIDED FOR
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2647423
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Patent number 2,647,423
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Issue date Aug 4, 1953
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B21 - MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL PUNCHING...
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2643439
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Patent number 2,643,439
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Issue date Jun 30, 1953
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B21 - MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL PUNCHING...
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2643438
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Patent number 2,643,438
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Issue date Jun 30, 1953
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B21 - MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL PUNCHING...