42 Design and testing for others of electronic component devices, assemblies and systems, namely, underwater sensor systems, devices, fittings, and parts, for acoustic tracking, noise and thermal measurement and surveillance; consulting services relating to the development of electronic component devices, assemblies and systems, namely, underwater sensor systems, devices, fittings, and parts, for acoustic tracking, noise and thermal measurement, and surveillance; product research and development services and engineering services relating to underwater sensor systems; design services for others of cabled sensor systems and short-haul telecommunications cable installations