IPC Subgroup
G01L 21/36 using radioactive substances
Introduced: September 1968
Last revised: January 2006
Full Title
Vacuum gauges > by making use of ionisation effects > using radioactive substances
Classification Context
- Section:
- PHYSICS
- Class:
- MEASURING; TESTING
- Subclass:
- MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE