Eye-ball indicator
- Made:
- 1920
This image is released under a CC BY-NC-SA 4.0
Licence
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© The Board of Trustees of the Science Museum
Eye-ball indicator as formerly used on manual boards to indicate a calling line (1920)
Details
- Category:
- Telecommunications
- Object Number:
- 1970-536
- type:
- indicator
- credit:
- Plessey Telecommunications
