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Transit concrete mixer
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Patent number 3,933,341
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Issue date Jan 20, 1976
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Gerhard Hudelmaier
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B28 - WORKING CEMENT, CLAY, OR STONE
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2687286
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Patent number 2,687,286
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Issue date Aug 24, 1954
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B28 - WORKING CEMENT, CLAY, OR STONE
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1861416
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Patent number 1,861,416
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Issue date May 31, 1932
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B28 - WORKING CEMENT, CLAY, OR STONE
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1650592
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Patent number 1,650,592
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Issue date Nov 29, 1927
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B28 - WORKING CEMENT, CLAY, OR STONE
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1641913
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Patent number 1,641,913
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Issue date Sep 6, 1927
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B28 - WORKING CEMENT, CLAY, OR STONE