DIFF Subgroup
G04D 7/02 for mainsprings
Introduced: September 1968
Full Title
Full titles differ between systems:
IPC:
Measuring, counting, calibrating, testing, or regulating apparatus > for mainsprings
CPC:
Measuring, counting, calibrating, testing or regulating apparatus > for mainsprings
No child classifications to compare. This is a leaf node in both IPC and CPC.