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  • G01L21/00
    		•  Vacuum gauges HB CC 2F055
  • G01L21/00@A
    		•  Vacuum pressures of particular objects for vacuum shutters HB CC 2F055
  • G01L21/00@Z
    		•  Others HB CC 2F055
  • G01L21/02
    		•  .having a compression chamber in which gas, whose pressure is to be measured, is compressed HB CC 2F055
  • G01L21/04
    		•  ..wherein the chamber is closed by liquid; Vacuum gauges of the McLeod type HB CC 2F055
  • G01L21/06
    		•  ...actuated by rotating or inverting the measuring device HB CC 2F055
  • G01L21/08
    		•  .by measuring variations in the transmission of acoustic waves through the medium, the pressure of which is to be measured HB CC 2F055
  • G01L21/10
    		•  .by measuring variations in the heat conductivity of the medium, the pressure of which is to be measured HB CC 2F055
  • G01L21/12
    		•  ..measuring changes in electric resistance of measuring members, e.g. of filaments; Vacuum gauges of the Pirani type HB CC 2F055
  • G01L21/14
    		•  ..using thermocouples HB CC 2F055
  • G01L21/16
    		•  .by measuring variation of frictional resistance of gases HB CC 2F055
  • G01L21/18
    		•  ..using a pendulum HB CC 2F055
  • G01L21/20
    		•  ..using members oscillating about a vertical axis HB CC 2F055
  • G01L21/22
    		•  ..using resonance effects of a vibrating body; Vacuum gauges of the Klumb type HB CC 2F055
  • G01L21/24
    		•  ..using rotating members; Vacuum gauges of the Langmuir type HB CC 2F055
  • G01L21/26
    		•  .by making use of radiometer action, i.e. of the pressure caused by the momentum of molecules passing from a hotter to a cooler member; Vacuum gauges of the Knudsen type HB CC 2F055
  • G01L21/28
    		•  ..using torsional rotary measuring members HB CC 2F055
  • G01L21/30
    		•  .by making use of ionisation effects HB CC 2F055
  • G01L21/30@A
    		•  Measuring vacuum pressures in particular fields using of ionisation or discharging HB CC 2F055
  • G01L21/30@Z
    		•  Others HB CC 2F055
  • G01L21/32
    		•  ..using electric discharge tubes with thermionic cathodes HB CC 2F055
  • G01L21/34
    		•  ..using electric discharge tubes with cold cathodes HB CC 2F055
  • G01L21/36
    		•  ..using radioactive substances HB CC 2F055
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