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...The radio was based on a crystal detector with
"an active point". The edge of a steel wire was touching a polycrystal of natural semiconductor.
With a small knob the position of the steel pin could be changed. ...
The first Rrussian vacuum tube was created in 1915 by
M.A.Bonch-Brouyevich, a talented engeneer, when he was Chief of the military telegraphic receiver
in Tver. This tube later nicknamed as the "Babushka" (Grandma) honestly worked in the
receiver of telegraphic signals, successfully compete with imported French valves
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