"Crystavox" loud speaker

Crystavox' loud speaker with microphone amplifier incorporated.'

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Crystavox' loud speaker with microphone amplifier incorporated.'
Science Museum Group
© The Board of Trustees of the Science Musuem

"Crystavox" loud speaker with microphone amplifier incorporated.

Details

Category:
Radio Communication
Object Number:
1951-214
type:
amplifiers
credit:
Mr. S.C. Renow.