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3497899
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Patent number 3,497,899
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Issue date Mar 3, 1970
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E03 - WATER SUPPLY SEWERAGE
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3022908
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Patent number 3,022,908
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Issue date Feb 27, 1962
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B08 - CLEANING
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2256045
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Patent number 2,256,045
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Issue date Sep 16, 1941
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E03 - WATER SUPPLY SEWERAGE
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2196116
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Patent number 2,196,116
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Issue date Apr 2, 1940
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E03 - WATER SUPPLY SEWERAGE
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1973560
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Patent number 1,973,560
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Issue date Sep 11, 1934
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E03 - WATER SUPPLY SEWERAGE
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1376995
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Patent number 1,376,995
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Issue date May 3, 1921
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E03 - WATER SUPPLY SEWERAGE