De Forest "Photion" tube, 1926.

Made:
1926
maker:
Lee De
De Forest Photion' tube, 1926.'

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De Forest Photion' tube, 1926.'
Science Museum Group
© The Board of Trustees of the Science Museum

De Forest "Photion" tube, 1926.

Details

Category:
Sound Reproduction
Object Number:
1929-550
type:
tube
credit:
British Talking Pictures Ltd.