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

installation, assembly and maintenance and repair of data communication circuits, overvoltage and electrical signal detection, modules, printed circuit boards and electrical and electronic devices, fiber optic telecommunication equipment, telecommunication apparatus, computers, and illuminated advertising equipment and split flap and rolling band display monitors, and gasoline station equipment