Spangenberg, K.R.
Vacuum tubes - New York McGraw Hill 1948 - 860 p., ill. - McGraw Hill Electrical & Electronic Engineering series .
621.3.032.1 / S7
Vacuum tubes - New York McGraw Hill 1948 - 860 p., ill. - McGraw Hill Electrical & Electronic Engineering series .
621.3.032.1 / S7