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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
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FR604935D1925-09-011925-10-22Méthode et moyens pour éviter le frottement au départ et diminuer ou bo lir le frottement de glissement
ExpiredFR604935A
(fr)