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3761387
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Issue date Sep 25, 1973
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C04 - CEMENTS CONCRETE ARTIFICIAL STONE CERAMICS REFRACTORIES
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3304191
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Patent number 3,304,191
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A61 - MEDICAL OR VETERINARY SCIENCE HYGIENE
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3261269
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Patent number 3,261,269
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Issue date Jul 19, 1966
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3221615
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3091543
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Issue date May 28, 1963
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E01 - CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
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3070449
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Patent number 3,070,449
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Issue date Dec 25, 1962
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C04 - CEMENTS CONCRETE ARTIFICIAL STONE CERAMICS REFRACTORIES
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3035932
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C10 - PETROLEUM, GAS OR COKE INDUSTRIES TECHNICAL GASES CONTAINING CARBON MON...
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3010893
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Patent number 3,010,893
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Issue date Nov 28, 1961
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2967815
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Patent number 2,967,815
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2861894
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Patent number 2,861,894
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2774716
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Patent number 2,774,716
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2603592
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Patent number 2,603,592
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C10 - PETROLEUM, GAS OR COKE INDUSTRIES TECHNICAL GASES CONTAINING CARBON MON...
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2478654
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Patent number 2,478,654
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2395041
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Patent number 2,395,041
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Issue date Feb 19, 1946
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2297455
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Patent number 2,297,455
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2273725
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Patent number 2,273,725
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2149275
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Patent number 2,149,275
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2007378
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Patent number 2,007,378
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1933796
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Patent number 1,933,796
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1917384
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Patent number 1,917,384
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Issue date Jul 11, 1933
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1844899
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Patent number 1,844,899
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Issue date Feb 9, 1932
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1826428
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Patent number 1,826,428
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Issue date Oct 6, 1931
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