DIFF Subgroup
G04C 3/04 wherein movement is regulated by a balance
Introduced: September 1968
Full Title
Full titles differ between systems:
IPC:
Electromechanical clocks or watches independent of other time-pieces and in which the movement is maintained by electric means > wherein movement is regulated by a balance
CPC:
Electromechanical clocks or watches independent of other time-pieces and in which the movement is maintained by electric means (clocks driven by synchronous motors G04C15/00) > wherein movement is regulated by a balance
CPC subdivides this area 3x more granularly than IPC with 2 additional codes.
2 codes are CPC-only extensions.
IPC defines codes here since 1980.
Child Classifications
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- G04C 3/06 using electromagnetic coupling between electric power source and balance since 1980 +5 CPC IPC+CPC Available in IPC and CPC