DIFF Main Group
G01D 7/00 Indicating measured values
Introduced: September 1968
CPC subdivides this area 3x more granularly than IPC with 3 additional codes.
3 codes are CPC-only extensions.
Child Classifications
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- G01D 7/12 Audible indication of meter readings, e.g. for the blind since 1974 IPC+CPC Available in IPC and CPC