DIFF Subgroup
G01C 19/38 with north-seeking action by other than magnetic means, e.g. gyrocompasses using earth's rotation
Introduced: September 1968
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 a direction in the horizontal plane, e.g. directional gyroscopes > with north-seeking action by other than magnetic means, e.g. gyrocompasses using earth's rotation
No child classifications to compare. This is a leaf node in both IPC and CPC.