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Publication of FR803693ApublicationCriticalpatent/FR803693A/en
G01C—MEASURING DISTANCES, LEVELS OR BEARINGS; SURVEYING; NAVIGATION; GYROSCOPIC INSTRUMENTS; PHOTOGRAMMETRY OR VIDEOGRAMMETRY
G01C19/00—Gyroscopes; Turn-sensitive devices using vibrating masses; Turn-sensitive devices without moving masses; Measuring angular rate using gyroscopic effects
G01C19/02—Rotary gyroscopes
G01C19/44—Rotary gyroscopes for indicating the vertical
FR803693D1935-06-271935-06-27
Method and apparatus for the materialization of the exact vertical of the place, and applications relating thereto
ExpiredFR803693A
(en)