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3133333
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Patent number 3,133,333
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Issue date May 19, 1964
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B28 - WORKING CEMENT, CLAY, OR STONE
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3028652
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Patent number 3,028,652
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Issue date Apr 10, 1962
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B28 - WORKING CEMENT, CLAY, OR STONE
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2978777
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Patent number 2,978,777
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Issue date Apr 11, 1961
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B28 - WORKING CEMENT, CLAY, OR STONE
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2971239
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Patent number 2,971,239
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Issue date Feb 14, 1961
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B28 - WORKING CEMENT, CLAY, OR STONE