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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C02F1/04
by distillation or evaporation
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C02F1/046
under vacuum produced by a barometric column
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