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Prestressed concrete pipe
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Patent number 3,982,565
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Issue date Sep 28, 1976
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Nippon Hume Pipe Company Limited
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Hideo Iida
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B28 - WORKING CEMENT, CLAY, OR STONE
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3911964
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Patent number 3,911,964
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Issue date Oct 14, 1975
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B28 - WORKING CEMENT, CLAY, OR STONE
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3758940
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Patent number 3,758,940
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Issue date Sep 18, 1973
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B28 - WORKING CEMENT, CLAY, OR STONE
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3716210
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Patent number 3,716,210
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Issue date Feb 13, 1973
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B28 - WORKING CEMENT, CLAY, OR STONE
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3642033
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Patent number 3,642,033
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Issue date Feb 15, 1972
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B28 - WORKING CEMENT, CLAY, OR STONE
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3520968
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Patent number 3,520,968
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Issue date Jul 21, 1970
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B28 - WORKING CEMENT, CLAY, OR STONE
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3467144
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Patent number 3,467,144
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Issue date Sep 16, 1969
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B28 - WORKING CEMENT, CLAY, OR STONE
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3276092
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Patent number 3,276,092
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Issue date Oct 4, 1966
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B28 - WORKING CEMENT, CLAY, OR STONE
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3275040
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Patent number 3,275,040
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Issue date Sep 27, 1966
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B28 - WORKING CEMENT, CLAY, OR STONE
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3260020
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Patent number 3,260,020
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Issue date Jul 12, 1966
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B28 - WORKING CEMENT, CLAY, OR STONE
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3234619
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Patent number 3,234,619
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Issue date Feb 15, 1966
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B28 - WORKING CEMENT, CLAY, OR STONE
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3107158
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Patent number 3,107,158
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Issue date Oct 15, 1963
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B28 - WORKING CEMENT, CLAY, OR STONE
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3046631
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Patent number 3,046,631
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Issue date Jul 31, 1962
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B28 - WORKING CEMENT, CLAY, OR STONE
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3034536
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Patent number 3,034,536
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Issue date May 15, 1962
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B28 - WORKING CEMENT, CLAY, OR STONE
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3034537
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Patent number 3,034,537
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Issue date May 15, 1962
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B28 - WORKING CEMENT, CLAY, OR STONE
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2948042
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Patent number 2,948,042
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Issue date Aug 9, 1960
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B28 - WORKING CEMENT, CLAY, OR STONE
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2916794
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Patent number 2,916,794
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Issue date Dec 15, 1959
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B28 - WORKING CEMENT, CLAY, OR STONE
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2913798
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Patent number 2,913,798
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Issue date Nov 24, 1959
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B28 - WORKING CEMENT, CLAY, OR STONE
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2865078
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Patent number 2,865,078
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Issue date Dec 23, 1958
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B28 - WORKING CEMENT, CLAY, OR STONE
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2771655
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Patent number 2,771,655
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Issue date Nov 27, 1956
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B28 - WORKING CEMENT, CLAY, OR STONE
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2747249
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Patent number 2,747,249
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Issue date May 29, 1956
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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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2709845
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Patent number 2,709,845
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Issue date Jun 7, 1955
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B28 - WORKING CEMENT, CLAY, OR STONE