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3164302
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Patent number 3,164,302
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Issue date Jan 5, 1965
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E03 - WATER SUPPLY SEWERAGE
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2672622
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Patent number 2,672,622
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Issue date Mar 23, 1954
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E03 - WATER SUPPLY SEWERAGE
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2406314
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Patent number 2,406,314
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Issue date Aug 27, 1946
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E03 - WATER SUPPLY SEWERAGE
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1950139
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Patent number 1,950,139
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Issue date Mar 6, 1934
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E03 - WATER SUPPLY SEWERAGE
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1643286
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Patent number 1,643,286
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Issue date Sep 20, 1927
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E03 - WATER SUPPLY SEWERAGE
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1260180
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Patent number 1,260,180
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Issue date Mar 19, 1918
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E03 - WATER SUPPLY SEWERAGE
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939424
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Patent number 939,424
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Issue date Nov 9, 1909
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E03 - WATER SUPPLY SEWERAGE
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507656
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Patent number 507,656
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Issue date Oct 31, 1893
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E03 - WATER SUPPLY SEWERAGE