C
SECTION C — CHEMISTRY AND METALLURGY
CHEMISTRY
C02
TREATMENT OF WATER, WASTE WATER AND SEWAGE
(distilling, filtering, separating
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B01
)
C02B
TREATMENT OF WATER, e.g. PURIFICATION
(adding materials to water to prevent corrosion of metals
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C23F
)
C02C
TREATMENT OF SEWAGE AND WASTE WATER
(
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C02B
takes precedence)
C02D
WATER IMPREGNATED WITH CARBON DIOXIDE OR OTHER GASES