Original Swedish "Birka" bimetal direct regulator in vacuum tube

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Original Swedish Birka' bimetal direct regulator in vacuum tube
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.

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Original Swedish "Birka" bimetal direct regulator in vacuum tube

Details

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