DIFF Main Group
H03B 21/00 Generation of oscillations by combining unmodulated signals of different frequencies (H03B19/00 takes precedence; frequency changing circuits in general H03D)
Introduced: September 1968
Title
Titles differ between systems:
IPC: Generation of oscillations by combining unmodulated signals of different frequencies
CPC: Generation of oscillations by combining unmodulated signals of different frequencies (H03B19/00 takes precedence; frequency changing circuits in general H03D)
Full Title
Full titles differ between systems:
IPC:
Generation of oscillations by combining unmodulated signals of different frequencies
CPC:
Generation of oscillations by combining unmodulated signals of different frequencies (H03B19/00 takes precedence; frequency changing circuits in general H03D)
IPC and CPC are identically structured here. All 1 subcodes exist in both systems.
IPC defines codes here since 1980.
Child Classifications
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- H03B 21/01 by beating unmodulated signals of different frequencies since 1980 IPC+CPC Available in IPC and CPC