Receivers of electronic signals; transmitters of electronic signals; apparatus for transmission of communication; antennas; monitor signal amplifiers; data cables; telecommunication cables; cables, electric; optical fiber cables; printed circuit boards; Transmitters of electronic signals, namely, optical fiber signal transmitters; Receivers of electronic signals, namely, optical fiber signal receivers; fiber optic connectors; switches, electric; data processing equipment, namely, couplers; electrical plugs; electric connectors; signal cables for electrical signal transmission systems; coaxial cables; Reels for electric cords