Original Swedish "Birka" bimetal direct regulator in vacuum tube
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Science Museum Group
© The Board of Trustees of the Science Museum
Original Swedish "Birka" bimetal direct regulator in vacuum tube, complete with condenser, type 141 h.
Details
- Category:
- Electricity Supply
- Object Number:
- 1932-392
- type:
- regulator
- credit:
- Birka Regulator Co.
