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G01C—MEASURING DISTANCES, LEVELS OR BEARINGS; SURVEYING; NAVIGATION; GYROSCOPIC INSTRUMENTS; PHOTOGRAMMETRY OR VIDEOGRAMMETRY
G01C17/00—Compasses; Devices for ascertaining true or magnetic north for navigation or surveying purposes
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FR451080D1912-02-031912-02-03
Compass device for air navigation indicating the course angle and the drift angle by a unique index
ExpiredFR451080A
(en)
Device for plotting, on a reduced scale, the map of the path traveled by a vehicle and giving all indications, speeds, accelerations and others relating to the movement of this vehicle