DIFF Subgroup
C01B 13/0229 Full Title
Oxygen; Ozone; Oxides or hydroxides in general > Preparation of oxygen (by liquefying F25J)
Of 3 combined children, 0 exist in both systems.
3 codes are CPC-only extensions.
C01B 13/0229 Oxygen; Ozone; Oxides or hydroxides in general > Preparation of oxygen (by liquefying F25J)
Of 3 combined children, 0 exist in both systems.
3 codes are CPC-only extensions.