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Publication of FR479628ApublicationCriticalpatent/FR479628A/fr
G02B23/00—Telescopes, e.g. binoculars; Periscopes; Instruments for viewing the inside of hollow bodies; Viewfinders; Optical aiming or sighting devices
G02B23/16—Housings; Caps; Mountings; Supports, e.g. with counterweight
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FR479628D1915-08-311915-08-31Dispositif pour protéger l'objectif des télescopes de la brume
ExpiredFR479628A
(fr)