Transmitters of electronic signals; Network communication equipment; Anti-interference devices, electricity; measuring apparatus; measuring instruments; Surveying machines and instruments; Apparatus and instruments for physics; High-frequency apparatus; Dynamometers; Frequency meters; Cables,electric; Amplifiers; Figuline filters; Couplings,electric; Electronic apparatus for testing compression, strength, hardness and tensile characteristics of industrial materials; Instrument components and instrument special materials; Telecommunications transmitters