Single pole receiver with key
This image is released under a CC BY-NC-SA 4.0
Licence
Single pole receiver with key
Science Museum Group
Single pole receiver with key, used in telephone exchanges between 1880 and 1885 (11)
Details
- Category:
- Telecommunications
- Object Number:
- 1923-213
- type:
- receiver
- credit:
- Institution of Electrical Engineers
