Submarine cable telephone repeater, 1940-1950
Submarine cable telephone repeater less outer casing, unknown maker, 1940-1950.
This was the world's first submarine telephone cable repeater to use thermionic valves. It was inserted in the in the cable across the Irish Sea that connected Anglesey and the Isle of Man.
- Object Number:
- thermionic valve
- component - object
- Donated by BT Heritage and Archives
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