9 low energy electrical circuits for data communication, telecommunications applications, and control engineering; apparatus for monitoring, measuring, testing and controlling electrical signals; overvoltage and electrical current protection apparatus; namely, overvoltage arrestor magazines and overvoltage arrestor modules; electro-technical and electronic components, apparatus, and instruments; namely, varistors, transistors, resistors, and printed circuit boards; electrical cables, electrical wires, electrical conductors, and electrical terminal and connection parts therefor; electric switches, electrical distribution panels and boxes and cabinets therefor; fiber optic cables and light guides, fiber optic terminals and apparatus for the transfer, distribution and connection of fiber optic transmissions; namely, optical receivers, optical transmitters, and optical fibers; telephone installations comprising exchanges, interface units for electronic data processing and inquiry stations for electronic data processing, comprising telephone exchanges for recordal of arriving telephone calls; public exchange lines, terminals for an integrated service digital network (ISDN); telefax apparatus and connecting wires therefor; telephones; modems; facsimile machines for television, telephone and telescopy transmission and parts therefor; electronic computers; computer programs for use in telecommunication and data transfer; information display devices; namely, light emitting diode and electroluminescence displays and illuminated advertisement boxes; split flap and rolling band display devices and control units, monitors, and program to operate such information display devices