DIFF Main Group
G01F 9/00 Measuring volume flow relative to another variable, e.g. of liquid fuel for an engine
Introduced: September 1968
CPC subdivides this area 4x more granularly than IPC with 3 additional codes.
3 codes are CPC-only extensions.
Child Classifications
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- G01F 9/02 wherein the other variable is the speed of a vehicle +2 CPC IPC+CPC Available in IPC and CPC