??????????????????????????????????????????????????????? · ??????· ???? · ???? · ???? · ???? · ????G—PHYSICS G02—OPTICS G02B—OPTICAL Aspects, Programs OR Equipment G02B23/00—Telescopes, e.g. binoculars; Periscopes; Instruments for viewing the inside of hollow bodies; Viewfinders; Optical aiming or sighting equipment G02B23/14—Viewfin… Read More