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Basic Theory and Applications of Electron Tubes(1952) 

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The success of modern military operations, as well as of the peacetime activities of the armed forces, 
depends in a great measure on signal communication facilities. Whether on the offence or the defence, 
in the front lines or far behind the lines, exchange of information is vital to the successful movement of personnel and equipment. 
On the ground, in the air, or below the surface of the seas, electronic devices are in daily use, 
and in every one of these uses the electron tube is a vital element.