DIFF Subgroup
H03D 7/1425 Full Title
Transference of modulation from one carrier to another, e.g. frequency-changing (H03D9/00, H03D11/00 take precedence; dielectric amplifiers, magnetic amplifiers, parametric amplifiers used as a frequency-changers H03F) > Balanced arrangements
Of 8 combined children, 0 exist in both systems.
8 codes are CPC-only extensions.