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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9/00
Multistage treatment of water, waste water or sewage
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C02F9/20
Portable or detachable small-scale multistage treatment devices, e.g. point of use or laboratory water purification systems
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