Preece's electric semaphore repeater 1862
Preece's electric semaphore repeater 1862, comprising a small electro-magnetically operated semophore on wooden base, with cover in two parts.
Details
- Category:
- Signalling & Telecommunications
- Object Number:
- 1912-2
- type:
- repeater
- credit:
- H.M. Postmaster General
