scope:

Gives symbols on semiconductor devices (symbol elements;qualifying symbols particular to semiconductor devices;examples of semiconductor diodes;examples of thryristors;examples of transistors;examples of photo-sensitive and magnetic fields sensitive devices), electron tubes (symbol elements, general;symbol elements mainly applicable to cathode ray-tubes and television camera tubes, symbol elements mainly applicable to microwave tubes;symbol elements applicable to miscellaneous tubes, including mercury arc rectifiers;examples of electronic tubes;examples of cathode-ray tubes;examples of microwave tubes;examples of miscellaneous tubes including mercury arc rectifiers), radiation detectors and electrochemical devices (examples of ionizing radiation detectors;electrochemical devices).