Housings of metal and/or plastic, namely, housing enclosures specially adapted for general use with electrotechnical and electronic devices, namely, laboratory instruments and apparatus for the exchange of substances and heat, programmable logic controllers, electric control panels, lighting control panels, photometers, ammeters, DC potentiometers, inclinometers, temperature meters, watt meters, current meters, resistance measuring instruments, conductivity meters, electroplating apparatus for electroplating purposes, apparatus for recording, transmission or reproduction of sound or images, blank magnetic data carriers, automatic vending machines, calculating machines, data processors and computers, computer monitors, liquid crystal display screens, liquid crystal panels, computer mouse, computer keypads, push buttons, and parts therefor, namely, panels specially adapted for housings for said electric and electronic instruments, apparatus and devices; housing enclosures of metal and plastic adapted for electronic and electrotechnical devices, namely, the receptacle of electric and electronic junctions, control panels, plugs, apparatus and equipment for data input, data transfer, data storage, data processing, data output, display devices, BUS PCB applications, signal receivers and transmitters, silicon wafers, semiconductors, integrated circuits, accumulators, batteries, switches, screwed cable glands and hose fittings, electromagnetic shielding for electronic devices and installations