TY  - BOOK
AU  - Havinga J F
AU  - Markus N S
AU  - Otte J
ED  - Philips Technical Library
TI  - Electronic valves: data and circuits of radio receiver and amplifier valves
U1  - 621.38413 
PY  - 1952///
CY  - Eindhoven
PB  - Philips Technical Library
KW  - Radio instruments
ER  -