Binder containig illustrated information leaflets about various types of electronic valves sold under the brandnames of Mazda and Ediswan. Types of valves include power amplifier & transmitting valves, mercury vapour rectifiers, cathod ray tubes, battery valves, A.C. main valves, A.C./D.C. mains valves and car-radio valves.
- Electrical Engineering and Radios
- Open access.