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Mixer apparatus
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Patent number 4,368,984
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Issue date Jan 18, 1983
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National Engineering Company
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Leslie D. Rikker
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B22 - CASTING POWDER METALLURGY
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Foundry sand mixing machine
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Patent number 4,329,063
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Issue date May 11, 1982
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Baker Perkins Holdings Ltd.
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Albert Edwards
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B22 - CASTING POWDER METALLURGY
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Two-tube continuous sand muller
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Patent number 4,322,168
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Issue date Mar 30, 1982
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Carver Foundry Products
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Rodney L. Hartung
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B28 - WORKING CEMENT, CLAY, OR STONE
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Continuous sand muller
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Patent number 4,039,169
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Issue date Aug 2, 1977
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Carver Foundry Products
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Gordon Bartholomew
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B22 - CASTING POWDER METALLURGY
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3682448
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Patent number 3,682,448
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Issue date Aug 8, 1972
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B29 - WORKING OF PLASTICS WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL
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3430929
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Patent number 3,430,929
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Issue date Mar 4, 1969
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B22 - CASTING POWDER METALLURGY
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3430930
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Patent number 3,430,930
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Issue date Mar 4, 1969
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B22 - CASTING POWDER METALLURGY
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3387829
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Patent number 3,387,829
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Issue date Jun 11, 1968
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B22 - CASTING POWDER METALLURGY
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3346239
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Patent number 3,346,239
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Issue date Oct 10, 1967
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B22 - CASTING POWDER METALLURGY
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3268214
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Patent number 3,268,214
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Issue date Aug 23, 1966
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B22 - CASTING POWDER METALLURGY
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3176877
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Patent number 3,176,877
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Issue date Apr 6, 1965
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B28 - WORKING CEMENT, CLAY, OR STONE