by using liquids

Introduced: September 1968

Full Title

Measuring inclination, e.g. by clinometers, by levels > by using liquids

CPC subdivides this area 3x more granularly than IPC with 3 additional codes.

3 codes are CPC-only extensions.

Note: 3 CPC extensions are marked as secondary classification only.

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G01C 2009/182 2nd only CPC only CPC only
G01C 2009/185 2nd only CPC only CPC only
G01C 2009/187 2nd only CPC only CPC only
G01C 9/20 the indication being based on the inclination of the surface of a liquid relative to its container IPC+CPC Available in IPC and CPC
G01C 9/24 in closed containers partially filled with liquid so as to leave a gas bubble IPC+CPC Available in IPC and CPC