9 Electrical and electronic data recording, data processing, data transmission, data storage and data output devices, namely, general purpose computers, central processing units, personal computers; computer workstations comprising personal computers, computer monitors, computer printers and computer hard drives, support structures for supporting said computer units, wiring ducts, electronic data storage devices, namely, semiconductor memories, hard-disk drives, CD-ROM drives and DVD-drives, floppy disk drives; computer terminals; interface devices for connecting computer system units to each other and to telecommunication, telesurveying and telecontrolling apparatus; data input and output devices for computers, namely, computer keyboards, scanners, electronic video cameras, electrical and electronic sensors, monitors and computer display screens, computer controlled printers and plotters; devices for electronic recording, storing, processing and reproduction of digital images and sound information; control devices for controlling data collecting instruments and medical treatment apparatus; recording carriers for images, sound and data