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Publication of FR491699ApublicationCriticalpatent/FR491699A/fr
G01C—MEASURING DISTANCES, LEVELS OR BEARINGS; SURVEYING; NAVIGATION; GYROSCOPIC INSTRUMENTS; PHOTOGRAMMETRY OR VIDEOGRAMMETRY
G01C5/00—Measuring height; Measuring distances transverse to line of sight; Levelling between separated points; Surveyors' levels
G01C5/005—Measuring height; Measuring distances transverse to line of sight; Levelling between separated points; Surveyors' levels altimeters for aircraft
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Radar, Positioning & Navigation
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Remote Sensing
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FR491699D1916-02-101916-02-10Indicateur lumineux pour l'atterrissage de nuit des aéroplanes
ExpiredFR491699A
(fr)