DIFF Subgroup
G04C 3/033 using torsion pendulums; using conical pendulums
Introduced: January 1980
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 pendulum > using torsion pendulums; using conical pendulums
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 pendulum > using torsion pendulums; using conical pendulums
Of 1 combined children, 0 exist in both systems.
1 codes are CPC-only extensions.
Child Classifications
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