DIFF Subgroup
G01L 23/04 involving means subjected to known counteracting pressure
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 > involving means subjected to known counteracting pressure
No child classifications to compare. This is a leaf node in both IPC and CPC.