G01L21/16 - CPC Classification Index

ClassID:

166886 ⎘

G01L21/16 - CPC Classification

Classification description:

Vacuum gauges by measuring variation of frictional resistance of gases

Sub-classes:

G01L21/18 » using a pendulum 0
G01L21/20 » using members oscillating about a vertical axis 0
G01L21/22 » using resonance effects of a vibrating body; Vacuum gauges of the Klumb type 12
G01L21/24 » using rotating members; Vacuum gauges of the Langmuir type 0