DIFF Subgroup
G01L 23/22 for detecting or indicating knocks in internal-combustion engines; Units comprising pressure-sensitive members combined with ignitors for firing internal-combustion engines
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 > for detecting or indicating knocks in internal-combustion engines; Units comprising pressure-sensitive members combined with ignitors for firing internal-combustion engines
Of 2 combined children, 0 exist in both systems.
2 codes are CPC-only extensions.
Note: 1 CPC extensions are marked as secondary classification only.
Child Classifications
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