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Concrete pipes
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Patent number 4,049,022
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Issue date Sep 20, 1977
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ARC Concrete Limited
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Robert M. Farahar
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B28 - WORKING CEMENT, CLAY, OR STONE
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3358342
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Patent number 3,358,342
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Issue date Dec 19, 1967
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B28 - WORKING CEMENT, CLAY, OR STONE
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3301278
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Patent number 3,301,278
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Issue date Jan 31, 1967
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B28 - WORKING CEMENT, CLAY, OR STONE
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3239906
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Patent number 3,239,906
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Issue date Mar 15, 1966
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B28 - WORKING CEMENT, CLAY, OR STONE
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2932874
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Patent number 2,932,874
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Issue date Apr 19, 1960
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B28 - WORKING CEMENT, CLAY, OR STONE
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2840880
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Patent number 2,840,880
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Issue date Jul 1, 1958
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B28 - WORKING CEMENT, CLAY, OR STONE
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2776450
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Patent number 2,776,450
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Issue date Jan 8, 1957
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B28 - WORKING CEMENT, CLAY, OR STONE
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2497160
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Patent number 2,497,160
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Issue date Feb 14, 1950
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B28 - WORKING CEMENT, CLAY, OR STONE
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2429012
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Patent number 2,429,012
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Issue date Oct 14, 1947
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B28 - WORKING CEMENT, CLAY, OR STONE
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2243218
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Patent number 2,243,218
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Issue date May 27, 1941
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B28 - WORKING CEMENT, CLAY, OR STONE
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2166175
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Patent number 2,166,175
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Issue date Jul 18, 1939
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B28 - WORKING CEMENT, CLAY, OR STONE
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2006594
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Patent number 2,006,594
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Issue date Jul 2, 1935
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B28 - WORKING CEMENT, CLAY, OR STONE
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1881323
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Patent number 1,881,323
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Issue date Oct 4, 1932
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B28 - WORKING CEMENT, CLAY, OR STONE
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1802762
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Patent number 1,802,762
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Issue date Apr 28, 1931
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B28 - WORKING CEMENT, CLAY, OR STONE
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1778389
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Patent number 1,778,389
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Issue date Oct 14, 1930
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B28 - WORKING CEMENT, CLAY, OR STONE
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1752626
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Patent number 1,752,626
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Issue date Apr 1, 1930
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B28 - WORKING CEMENT, CLAY, OR STONE
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1752627
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Patent number 1,752,627
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Issue date Apr 1, 1930
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B28 - WORKING CEMENT, CLAY, OR STONE
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1582586
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Patent number 1,582,586
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Issue date Apr 27, 1926
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B28 - WORKING CEMENT, CLAY, OR STONE
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1457185
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Patent number 1,457,185
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Issue date May 29, 1923
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B28 - WORKING CEMENT, CLAY, OR STONE
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1403683
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Patent number 1,403,683
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Issue date Jan 17, 1922
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B28 - WORKING CEMENT, CLAY, OR STONE
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1390134
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Patent number 1,390,134
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Issue date Sep 6, 1921
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B28 - WORKING CEMENT, CLAY, OR STONE
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852095
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Patent number 852,095
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Issue date Apr 30, 1907
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B28 - WORKING CEMENT, CLAY, OR STONE
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743513
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Patent number 743,513
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Issue date Nov 10, 1903
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B28 - WORKING CEMENT, CLAY, OR STONE
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647431
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Patent number 647,431
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Issue date Apr 10, 1900
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B28 - WORKING CEMENT, CLAY, OR STONE