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Water conditioning system controls
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Patent number 4,290,451
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Issue date Sep 22, 1981
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L. W. Fleckenstein, Inc.
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Andrew Fleckenstein
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C02 - TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
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Chemical feeder for water softeners
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Patent number 4,003,710
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Issue date Jan 18, 1977
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L. W. Fleckenstein, Inc.
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Andrew Joseph Fleckenstein
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B01 - PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL