“_Vacuum tubes_ are known as _valves_ in England. This is based on the fact that they can be used to control the flow of electricity, similar in concept to the way in which their mechanical namesakes are used to control… — Clive Max Maxfield Copy Share Image
“_Vacuum tubes_ are known as _valves_ in England. This is based on the fact that they can be used to control the flow of… — Clive Max Maxfield Copy Share Image
