Phonic motor clock type 1-B, patent no. 415758, serial no. 82137, by Muirhead and Co. Ltd., April 1937
Details
- Category:
- Telecommunications
- Object Number:
- 1989-1167
- type:
- phonic
- credit:
- Muirhead Vactric Components Limited
Phonic motor clock type 1-B, patent no. 415758, serial no. 82137, by Muirhead and Co. Ltd., April 1937