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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2301/00
General aspects of water treatment
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C02F2301/08
Multistage treatments, e.g. repetition of the same process step under different conditions
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