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PCE
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CPC Subgroup
G01C 19/52

operating by fluid means (G01C19/54 takes precedence)

Full Title

Gyroscopes; Turn-sensitive devices using vibrating masses; Turn-sensitive devices without moving masses; Measuring angular rate using gyroscopic effects > Rotary gyroscopes > for indicating the vertical > Erection devices for restoring rotor axis to a desired position > operating by fluid means (G01C19/54 takes precedence)