TY  - BOOK
AU  - Hallows,R.W.
AU  - Milward,H.K.
TI  - Introduction to valves
U1  - 621.38413 
PY  - 1953///
CY  - London
PB  - Wireless World
KW  - Electron tubes
KW  - Electrons
KW  - Emission
KW  - Diodes
KW  - Valves
KW  - Triodes
N1  - Includes index
ER  -