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Concrete pipe machine
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Patent number 4,600,373
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Issue date Jul 15, 1986
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GHA Lock Joint, Inc.
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Harold V. Swanson
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B28 - WORKING CEMENT, CLAY, OR STONE
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3304591
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Patent number 3,304,591
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Issue date Feb 21, 1967
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B28 - WORKING CEMENT, CLAY, OR STONE
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3012298
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Patent number 3,012,298
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Issue date Dec 12, 1961
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B28 - WORKING CEMENT, CLAY, OR STONE
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2965947
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Patent number 2,965,947
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Issue date Dec 27, 1960
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B28 - WORKING CEMENT, CLAY, OR STONE
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2850784
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Patent number 2,850,784
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Issue date Sep 9, 1958
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B28 - WORKING CEMENT, CLAY, OR STONE
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2839278
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Patent number 2,839,278
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Issue date Jun 17, 1958
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B28 - WORKING CEMENT, CLAY, OR STONE
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2822598
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Patent number 2,822,598
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Issue date Feb 11, 1958
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B28 - WORKING CEMENT, CLAY, OR STONE
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2735153
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Patent number 2,735,153
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Issue date Feb 21, 1956
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B28 - WORKING CEMENT, CLAY, OR STONE
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2724582
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Patent number 2,724,582
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Issue date Nov 22, 1955
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B28 - WORKING CEMENT, CLAY, OR STONE
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2703916
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Patent number 2,703,916
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Issue date Mar 15, 1955
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B28 - WORKING CEMENT, CLAY, OR STONE
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2222889
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Patent number 2,222,889
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Issue date Nov 26, 1940
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B28 - WORKING CEMENT, CLAY, OR STONE
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2038861
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Patent number 2,038,861
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Issue date Apr 28, 1936
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B28 - WORKING CEMENT, CLAY, OR STONE
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1979415
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Patent number 1,979,415
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Issue date Nov 6, 1934
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B28 - WORKING CEMENT, CLAY, OR STONE
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1954904
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Patent number 1,954,904
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Issue date Apr 17, 1934
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B28 - WORKING CEMENT, CLAY, OR STONE
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1789742
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Patent number 1,789,742
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Issue date Jan 20, 1931
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B28 - WORKING CEMENT, CLAY, OR STONE
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1786586
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Patent number 1,786,586
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Issue date Dec 30, 1930
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B28 - WORKING CEMENT, CLAY, OR STONE
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1579561
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Patent number 1,579,561
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Issue date Apr 6, 1926
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B28 - WORKING CEMENT, CLAY, OR STONE
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1562551
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Patent number 1,562,551
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Issue date Nov 24, 1925
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B28 - WORKING CEMENT, CLAY, OR STONE
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1544879
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Patent number 1,544,879
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Issue date Jul 7, 1925
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B28 - WORKING CEMENT, CLAY, OR STONE
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1532407
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Patent number 1,532,407
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Issue date Apr 7, 1925
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B28 - WORKING CEMENT, CLAY, OR STONE