C
SECTION C — CHEMISTRY AND METALLURGY
METALLURGY
C22
METALLURGY
(of iron
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C21
)
;
FERROUS OR NON-FERROUS ALLOYS
;
TREATMENT OF ALLOYS OR NON-FERROUS METALS
(production of metals by electrolysis or electrophoresis
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C25
)
C22D
( transferred to
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C22B 4/00
,
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C25C
)