Repair services, namely, maintenance, repair, installation of electronic component devices, assemblies and systems, namely, sonar systems, combat systems, radar systems, magnetic video recording rotary head scanner assemblies and broadcast quality video recording devices and parts therefore; refurbishing and rebuilding machines that have been worn or partially destroyed, namely, electronic component devices and assemblies, namely, sonar systems, combat systems, radar systems, magnetic video recording rotary head scanner assemblies, broadcast quality video recording devices, magnetic broadcast audio heads, magnetic flight recorder heads and magnetic strip card readers for defense and commercial markets, commercial upper drum and rotary head scanner assemblies for television broadcast and post-production facilities