BT&D

apparatus and instruments for optical transmission; namely, lasers and light emitting diodes, photo-detectors, optical transmitters, optical receivers, optical generators, optical switches, optical amplifiers, optical modulators, optical couplers, optical cables, optical waveguides; control circuitry; computers; microprocessors; and cables for electrical or optical signal transmission

instruction manuals for computer programs in the field of optical transmission and printed teaching material in the field of optical transmission; namely, technical data brochures