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3342136
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Patent number 3,342,136
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Issue date Sep 19, 1967
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E03 - WATER SUPPLY SEWERAGE
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3060954
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Patent number 3,060,954
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Issue date Oct 30, 1962
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G05 - CONTROLLING REGULATING
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3044402
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Patent number 3,044,402
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Issue date Jul 17, 1962
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E03 - WATER SUPPLY SEWERAGE
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3035522
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Patent number 3,035,522
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Issue date May 22, 1962
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E03 - WATER SUPPLY SEWERAGE
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2973773
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Patent number 2,973,773
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Issue date Mar 7, 1961
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E03 - WATER SUPPLY SEWERAGE