Seven specimens of "variable area" sound film (each about 6" long) made by R.C.A. Photophone process

Made:
1934
Seven specimens of variable area' sound film (each about 6'

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Seven specimens of variable area' sound film (each about 6'
Science Museum Group
© The Board of Trustees of the Science Museum

Seven specimens of "variable area" sound film (each about 6" long) made by R.C.A. Photophone process, 1934

Details

Category:
Sound Reproduction
Object Number:
1934-156
type:
specimen
credit:
R.C.A. Photophone Ltd.