5" diameter Rothermel piezo - electric loudspeaker

5 diameter Rothermel piezo - electric loudspeaker'

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5 diameter Rothermel piezo - electric loudspeaker'
Science Museum Group
© The Board of Trustees of the Science Museum

5" diameter Rothermel piezo - electric loudspeaker

Details

Category:
Radio Communication
Object Number:
1971-118
type:
loudspeaker
credit:
Pacy, G.R.