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G02B23/00—Telescopes, e.g. binoculars; Periscopes; Instruments for viewing the inside of hollow bodies; Viewfinders; Optical aiming or sighting devices
G02B23/14—Viewfinders
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FR929291D1942-06-251942-06-25Perfectionnements aux appareils de prise de vues cinématographiques
ExpiredFR929291A
(fr)