DIFF Subgroup
G09B 15/001 Full Title
Teaching music (metronomes G04F5/02)
Of 2 combined children, 0 exist in both systems.
2 codes are CPC-only extensions.
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G09B 15/001 Teaching music (metronomes G04F5/02)
Of 2 combined children, 0 exist in both systems.
2 codes are CPC-only extensions.