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IEC 60417C:1977 ed1.0

Заменен
Third supplement. — 14 стр.
Earth, clean (noiseless) earth, protective earth, frame or chassis, equipotentiality, omnidirectional microphone, bidirectional microphone, unidirectional or cardioid microphone, hydrophone, underwater sound projector, reversible transducer for underwater sound, transformer, clock; time switch; timer, Morse key; electric shaver outlet.
ICS
01.080.10 Public information symbols / Обозначения общедоступной информации