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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
FR359102D1905-11-031905-11-03
Viewfinder-leveler for cameras and leveling devices
ExpiredFR359102A
(en)