?????????? ????? ???? ????? ?????? ?????? ????? ???????? ???????? ??????? ?? ???? ??????? ???? ??? ?? ??????? ?????? ??? ? ??? ??? ???? ???? ???? ???? ???????? ??????????? ? ??? ????? ???? ??? ????? ?? ????? ???????.Originally these devices ended up massive and complex. Right after Lee de Forest invented the triode in 1907 metallic detectors made u… Read More