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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
G02B23/16—Housings; Caps; Mountings; Supports, e.g. with counterweight
G02B23/18—Housings; Caps; Mountings; Supports, e.g. with counterweight for binocular arrangements