C
CHEMISTRY; METALLURGY
C
CHEMISTRY; METALLURGY
C22
METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
C22
METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
C22B
PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
C22B
PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
25/00
Obtaining tin
25/00
Obtaining tin
C22B25/02
by dry processes
C22B25/02
by dry processes