TY  - BOOK
AU  - Aldous, W.H. 
AU  - Appleton, Edward 
TI  - Thermionic vacuum tubes and their applications
U1  - 537.533 
PY  - 1958///
CY  - New York
PB  - John wiley & son
KW  - Physics
KW  - Thermionic vacuum tubes
KW  - পদার্থবিদ্যা
N1  - Index include
ER  -