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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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2923996
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Patent number 2,923,996
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Issue date Feb 9, 1960
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B28 - WORKING CEMENT, CLAY, OR STONE
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2730783
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Patent number 2,730,783
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Issue date Jan 17, 1956
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B28 - WORKING CEMENT, CLAY, OR STONE
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2653370
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Patent number 2,653,370
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Issue date Sep 29, 1953
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B28 - WORKING CEMENT, CLAY, OR STONE
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2517001
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Patent number 2,517,001
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Issue date Aug 1, 1950
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B28 - WORKING CEMENT, CLAY, OR STONE
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2482949
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Patent number 2,482,949
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Issue date Sep 27, 1949
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B28 - WORKING CEMENT, CLAY, OR STONE
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2008339
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Patent number 2,008,339
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Issue date Jul 16, 1935
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B28 - WORKING CEMENT, CLAY, OR STONE
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1788718
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Patent number 1,788,718
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Issue date Jan 13, 1931
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B28 - WORKING CEMENT, CLAY, OR STONE
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1622325
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Patent number 1,622,325
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Issue date Mar 29, 1927
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B28 - WORKING CEMENT, CLAY, OR STONE
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1431565
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Patent number 1,431,565
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Issue date Oct 10, 1922
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B28 - WORKING CEMENT, CLAY, OR STONE
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1409732
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Patent number 1,409,732
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Issue date Mar 14, 1922
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B28 - WORKING CEMENT, CLAY, OR STONE