Inductor dynamic' moving iron loudspeaker

'Inductor dynamic' moving iron loudspeaker (Pat. No

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'Inductor dynamic' moving iron loudspeaker (Pat. No
Science Museum Group
The Board of Trustees of the Science Museum

'Inductor dynamic' moving iron loudspeaker (Pat. No. 238,310 of 1924-5)

Details

Category:
Radio Communication
Object Number:
1933-139
type:
loudspeaker
credit:
Voigt, P.G.A.H.