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2223307
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Patent number 2,223,307
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Issue date Nov 26, 1940
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B28 - WORKING CEMENT, CLAY, OR STONE
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1901207
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Patent number 1,901,207
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Issue date Mar 14, 1933
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B28 - WORKING CEMENT, CLAY, OR STONE
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1739066
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Patent number 1,739,066
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Issue date Dec 10, 1929
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B28 - WORKING CEMENT, CLAY, OR STONE
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1360468
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Patent number 1,360,468
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Issue date Nov 30, 1920
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B28 - WORKING CEMENT, CLAY, OR STONE
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1333705
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Patent number 1,333,705
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Issue date Mar 16, 1920
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B28 - WORKING CEMENT, CLAY, OR STONE