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B64F—GROUND OR AIRCRAFT-CARRIER-DECK INSTALLATIONS SPECIALLY ADAPTED FOR USE IN CONNECTION WITH AIRCRAFT; DESIGNING, MANUFACTURING, ASSEMBLING, CLEANING, MAINTAINING OR REPAIRING AIRCRAFT, NOT OTHERWISE PROVIDED FOR; HANDLING, TRANSPORTING, TESTING OR INSPECTING AIRCRAFT COMPONENTS, NOT OTHERWISE PROVIDED FOR
B64F1/00—Ground or aircraft-carrier-deck installations
B64F1/18—Visual or acoustic landing aids
B64F1/20—Arrangement of optical beacons
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FR665341D1928-03-211928-03-21Procédé et appareillage pour signaler aux aéronefs l'épaisseur du brouillard terrestre
ExpiredFR665341A
(fr)