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High density grout pump
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Patent number 5,122,038
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Issue date Jun 16, 1992
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Inco Limited
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Michael L. Malkoski
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B28 - WORKING CEMENT, CLAY, OR STONE
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Mortar mixing drum
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Patent number 4,877,327
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Issue date Oct 31, 1989
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Marvin E. Whiteman
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B28 - WORKING CEMENT, CLAY, OR STONE
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3339898
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Patent number 3,339,898
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Issue date Sep 5, 1967
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B28 - WORKING CEMENT, CLAY, OR STONE
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2495379
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Patent number 2,495,379
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Issue date Jan 24, 1950
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B28 - WORKING CEMENT, CLAY, OR STONE
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2441392
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Patent number 2,441,392
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Issue date May 11, 1948
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B28 - WORKING CEMENT, CLAY, OR STONE
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2300490
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Patent number 2,300,490
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Issue date Nov 3, 1942
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B28 - WORKING CEMENT, CLAY, OR STONE
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1660280
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Patent number 1,660,280
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Issue date Feb 21, 1928
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B28 - WORKING CEMENT, CLAY, OR STONE
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1331576
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Patent number 1,331,576
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Issue date Feb 24, 1920
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B28 - WORKING CEMENT, CLAY, OR STONE
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1327917
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Patent number 1,327,917
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Issue date Jan 13, 1920
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B28 - WORKING CEMENT, CLAY, OR STONE