CPC Subgroup
G01L 21/30 by making use of ionisation effects
Full Title
Vacuum gauges > by making use of ionisation effects
3 direct subcodes
Child Classifications
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- G01L 21/32 using electric discharge tubes with thermionic cathodes
- G01L 21/34 using electric discharge tubes with cold cathodes
- G01L 21/36 using radioactive substances