Patent classifications
C
CHEMISTRY; METALLURGY
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C02
TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
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C02F
TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
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1/00
Treatment of water, waste water, or sewage
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C02F1/68
by addition of specified substances, e.g. trace elements, for ameliorating potable water
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C02F1/683
by addition of complex-forming compounds
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