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[Letter 1931 March 28, New York to Chaplin Studios / D. P. Mone, General Talking Pictures Corporation] - ECCI00028341

Suspected infringement of DeForest patent concerning recording devices.
Documentary photograph
(original)
b/w and colour
Acetate negative, gelatine
1 acetate negative : gelatine ; 250x200 mm.
Also available: 2 positives.
ECCI00028341, RDOCS0010
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