KONCENT

OPTICAL TRANSMISSION FIBERS; OPTICAL DATA MEDIUM, NAMELY, OPTICAL FIBERS; OPTICAL APPARATUS AND INSTRUMENTS NAMELY, LASERS NOT FOR MEDICAL USE, LASER-BEAM CONTROLLERS; OPTICAL COMMUNICATION APPARATUS NAMELY, MODULATORS, TRANSMITTERS, RECEIVERS, MODEMS; OPTICAL PRODUCTS NAMELY, DISCS AND MIRRORS; COMPUTER CHIPS; PHOTO-ELECTRIC SWITCHES; GALENA CRYSTALS FOR OPTICAL COMMUNICATION DEVICES; OPTICAL LENSES, NAMELY PRISMS, CONCAVE LENSES, AND CONVEX LENSES; PHOTO ELECTRIC DEVICES, NAMELY, PHOTO-ELECTRIC RELAYS AND ELECTRIC SUNSET SWITCHES