9 Scientific, navigational, surveying, photographic, film, optical, weighing, measuring, signal, control, rescue, and instructional apparatus and instruments; apparatus and instruments for conducting, switching, converting, storing, regulating, and controlling electricity; devices for recording, transmitting, and playing back sound and image; computing machines, data processing devices, and computers; devices, assemblies, and components for transmitting electrical and optical signals or energy and for data transmission between units movable in relation to one another; rotating transmitters, slip rings, and collectors, and parts thereof.