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PCE
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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