Electrically maintained tuning fork type 4B

Electrically maintained tuning fork type 4B, no

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Electrically maintained tuning fork type 4B, no
Science Museum Group
© The Board of Trustees of the Science Museum

Electrically maintained tuning fork type 4B, no. 127009, by Muirhead

Details

Category:
Telecommunications
Object Number:
1989-1019
type:
contact driven
credit:
Muirhead Vactric Components Limited