HOLLOWBAND

Blank optical data carriers; Data processing equipment, namely, couplers; Communication modems; Electronic and optical communications instruments and components, namely, optical transmitters; Optical receivers; Electronic and optical communications instruments and components, namely, optical transceivers; Surveying apparatus and instruments; Optical glasses; Optical sensors; Optical couplers; Electric wires; Electric cables; Fiber optic cables; Optical fibres; Light conducting filaments