Electric and electronic measuring, signaling, checking, supervision, switch and control apparatus and instruments for filters and valves in gas cycle of Additive Manufacturing Systems, for frequency converters, for frequency inverters, for switch cabinets and control cabinets; Frequency converters; Frequency inverters; Magnet-operated valves; Control valves for regulating the flow of gases and liquids; Data processors and computers and downloadable computer software for the controlling and mo...