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Method of mixing mortar
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Patent number 4,195,933
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Issue date Apr 1, 1980
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Gerold W. Brailsford
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B28 - WORKING CEMENT, CLAY, OR STONE
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Mixer apparatus
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Patent number 4,104,737
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Issue date Aug 1, 1978
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Gerold Wayne Brailsford
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B28 - WORKING CEMENT, CLAY, OR STONE