TY  - BOOK
AU  - Beck,A.H.W.
TI  - Thermionic valves,: their theory and design
AV  - TK7872.V3 B39
U1  - 621.384132 
PY  - 1953///
CY  - Cambridge [Eng.]
PB  - University Press
KW  - Vacuum-tubes
ER  -