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Vibrators
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Patent number 5,433,523
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Issue date Jul 18, 1995
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International Pipe Machinery Corp.
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Thomas D. Grau
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B28 - WORKING CEMENT, CLAY, OR STONE
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Machine for making concrete pipes
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Patent number 5,167,967
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Issue date Dec 1, 1992
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International Pipe Machinery Corporation
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Tarek A. Adly
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B28 - WORKING CEMENT, CLAY, OR STONE
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Machine for making concrete pipes
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Patent number 5,147,196
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Issue date Sep 15, 1992
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International Pipe Machinery Corporation
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Tarek A. Adly
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B28 - WORKING CEMENT, CLAY, OR STONE
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Concrete pipe making machine
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Patent number 4,957,424
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Issue date Sep 18, 1990
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Hydrotile Machinery Company
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William J. Mitchell
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B28 - WORKING CEMENT, CLAY, OR STONE
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3922133
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Patent number 3,922,133
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Issue date Nov 25, 1975
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B28 - WORKING CEMENT, CLAY, OR STONE
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3829268
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Patent number 3,829,268
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Issue date Aug 13, 1974
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B28 - WORKING CEMENT, CLAY, OR STONE
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3701617
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Patent number 3,701,617
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Issue date Oct 31, 1972
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B28 - WORKING CEMENT, CLAY, OR STONE
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3642413
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Patent number 3,642,413
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Issue date Feb 15, 1972
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B28 - WORKING CEMENT, CLAY, OR STONE
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3396441
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Patent number 3,396,441
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Issue date Aug 13, 1968
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B28 - WORKING CEMENT, CLAY, OR STONE
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3141222
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Patent number 3,141,222
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Issue date Jul 21, 1964
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B28 - WORKING CEMENT, CLAY, OR STONE
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2994119
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Patent number 2,994,119
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Issue date Aug 1, 1961
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B28 - WORKING CEMENT, CLAY, OR STONE
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2870513
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Patent number 2,870,513
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Issue date Jan 27, 1959
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B28 - WORKING CEMENT, CLAY, OR STONE
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1782446
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Patent number 1,782,446
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Issue date Nov 25, 1930
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B28 - WORKING CEMENT, CLAY, OR STONE