Eyepieces; Objectives (lenses) (optics); Microscopes; Optical lenses; Magnifying glasses (optics); Periscopes; Optical apparatus and instruments; Apparatus and instruments for astronomy; Binoculars; Telescopes; Goggles; Video telephones; Apparatus for network communication; Electric remote control apparatus (other than remote controls for toys); Alarms; Radios; Walkie-talkies; Semi-conductors; Teaching apparatus; Surveying apparatus and instruments