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Making of ceramic tube
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Patent number 5,972,274
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Issue date Oct 26, 1999
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National Research Institute for Metals
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Yoshinari Kaieda
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B28 - WORKING CEMENT, CLAY, OR STONE
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Conduit molding machine
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Patent number 4,043,723
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Issue date Aug 23, 1977
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Stewart E. Slaton
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B28 - WORKING CEMENT, CLAY, OR STONE
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3006410
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Patent number 3,006,410
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Issue date Oct 31, 1961
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B28 - WORKING CEMENT, CLAY, OR STONE
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2969836
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Patent number 2,969,836
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Issue date Jan 31, 1961
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B28 - WORKING CEMENT, CLAY, OR STONE
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2477930
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Patent number 2,477,930
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Issue date Aug 2, 1949
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B28 - WORKING CEMENT, CLAY, OR STONE
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2470068
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Patent number 2,470,068
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Issue date May 10, 1949
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B28 - WORKING CEMENT, CLAY, OR STONE
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2377480
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Patent number 2,377,480
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Issue date Jun 5, 1945
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B28 - WORKING CEMENT, CLAY, OR STONE
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2373672
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Patent number 2,373,672
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Issue date Apr 17, 1945
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B28 - WORKING CEMENT, CLAY, OR STONE
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2374086
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Patent number 2,374,086
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Issue date Apr 17, 1945
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B28 - WORKING CEMENT, CLAY, OR STONE
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2369608
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Patent number 2,369,608
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Issue date Feb 13, 1945
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B28 - WORKING CEMENT, CLAY, OR STONE
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2019417
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Issue date Oct 29, 1935
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B28 - WORKING CEMENT, CLAY, OR STONE
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1807053
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Issue date May 26, 1931
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B28 - WORKING CEMENT, CLAY, OR STONE
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1499719
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Patent number 1,499,719
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Issue date Jul 1, 1924
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B28 - WORKING CEMENT, CLAY, OR STONE
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1438186
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B28 - WORKING CEMENT, CLAY, OR STONE
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1336712
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Patent number 1,336,712
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Issue date Apr 13, 1920
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B28 - WORKING CEMENT, CLAY, OR STONE