Telecontrol equipment and systems. Part 1. General considerations. Section 4. Basic aspects of telecontrol data transmission and organization of standards IEC 870-5 and IEC 870-6
Plugs, socket-outlets and couplers for industrial purposes. Part 5. Dimensional compatibility and interchangeability requirements for plugs, socket-outlets, ship connectors and ship inlets for low-voltage shore connection systems
State system for ensuring the uniformity of measurements. Acoustics. Reference zero for the calibration of audiometric equipment. Part 2. Reference equivalent threshold sound pressure levels of pure tones for insert earphones
