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G01C—MEASURING DISTANCES, LEVELS OR BEARINGS; SURVEYING; NAVIGATION; GYROSCOPIC INSTRUMENTS; PHOTOGRAMMETRY OR VIDEOGRAMMETRY
G01C21/00—Navigation; Navigational instruments not provided for in groups G01C1/00 - G01C19/00
G01C21/20—Instruments for performing navigational calculations
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FR823083D1936-09-221936-09-22Appareil, permettant la résolution de divers problèmes, utilisable en particulier pour la navigation à l'estime
ExpiredFR823083A
(fr)
Perfectionnements apportés aux moyens pour la détermination de facteurs dont la connaissance est nécessaire pour la navigation à l'estime, notamment pour celle des aéronefs