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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3/00
Biological treatment of water, waste water, or sewage
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C02F3/12
Activated sludge processes
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C02F3/1205
Particular type of activated sludge processes
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C02F3/121
Multistep treatment
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