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Block making machine
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Patent number 4,579,706
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Issue date Apr 1, 1986
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Adobe International, Inc.
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Henry Elkins
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B28 - WORKING CEMENT, CLAY, OR STONE
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3876360
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Patent number 3,876,360
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Issue date Apr 8, 1975
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B28 - WORKING CEMENT, CLAY, OR STONE
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3499069
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Patent number 3,499,069
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Issue date Mar 3, 1970
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B28 - WORKING CEMENT, CLAY, OR STONE
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2859502
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Patent number 2,859,502
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Issue date Nov 11, 1958
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B28 - WORKING CEMENT, CLAY, OR STONE
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2672669
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Patent number 2,672,669
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Issue date Mar 23, 1954
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B28 - WORKING CEMENT, CLAY, OR STONE
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2552930
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Patent number 2,552,930
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Issue date May 15, 1951
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B28 - WORKING CEMENT, CLAY, OR STONE
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1521292
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Patent number 1,521,292
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Issue date Dec 30, 1924
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B28 - WORKING CEMENT, CLAY, OR STONE
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516023
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Patent number 516,023
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Issue date Mar 6, 1894
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B28 - WORKING CEMENT, CLAY, OR STONE