DIFF Subgroup
G01L 23/26 Details or accessories
Introduced: September 1968
Full Title
Devices or apparatus for measuring or indicating or recording rapid changes, such as oscillations, in the pressure of steam, gas, or liquid; Indicators for determining work or energy of steam, internal-combustion, or other fluid-pressure engines from the condition of the working fluid > Details or accessories
IPC and CPC are identically structured here. All 3 subcodes exist in both systems.
Child Classifications
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- G01L 23/30 Means for indicating consecutively positions of pistons or cranks of internal-combustion engines in combination with pressure indicators IPC+CPC Available in IPC and CPC
- G01L 23/32 Apparatus specially adapted for recording pressure changes measured by indicators IPC+CPC Available in IPC and CPC