Scientific, surveying, photographic, cinematographic, optical, weighing, measuring, signaling, monitoring, lifesaving and teaching apparatus and instruments, namely, cables for electrical or optical signal transmission, electronic event recorders, electronic periscope control apparatus, command and weapons control systems on vessels comprising surveillance sensors for air space and sea areas, computer networking hardware and software for data transmission and data distribution, computers, operating software, electromechanical controls, and video display screens; nautical apparatus and instruments, in particular navigation and control systems for vessels; apparatus and instruments for conveying, distributing, transforming, storing, regulating or controlling electric current; apparatus for recording, transmission or reproduction of sound or images; blank magnetic data carriers; blank recording discs; automatic vending machines and mechanisms for coin operated apparatus; cash registers; calculating machines; data processing equipment and computers; fire-extinguishing apparatus; acoustic echo sounders for range measurement in water; acoustic fish finding units; multi-hydrophone listening devices, namely, underwater sound reception apparatus; acoustic locating and control units, in particular mine hunting systems; units for underwater telephony; radar apparatus; anti-collision units, namely, collision detection sensors and location transmitters; radio direction finders; electromagnetic wave signal processors; telephone connection units; telephone answering machines; telephone logging units, namely, communications event recording apparatus; radiotelephones; telephone transmitters; training simulators, namely, ship-handling simulators, weapon and defense counter measures firing simulators, combat training simulators, navigational training simulators, visual systems for simulators composed of video monitors, display screens, and command and control consoles; sonar, radar, metal detection, electromagnetic wave sensor, sound detection and motion sensor locating apparatus for automatic target acquisition, target tracking, target classification and target engagement; sonar equipment and parts thereof on surface and underwater vessels for weapon control, in particular of underwater propelled guided vehicles; command and weapon control systems on surface and underwater vessels, namely, signal processing units consisting of surveillance sensors for air space and sea areas; image compilers, namely, image processing apparatus; data processing units, in particular monitors and interface units for the connection of effectors