Didier; Andr? French audio engineer (Professor at the Conservatoire National des Arts et Metiers).The laboratoire de T閘閜honovision des Conservatoire des Arts et Metiers in Paris: Andr?Didier with the Chronophone Graumont. (Designed by L閛n Gaumont in 1910 to synchronise the cinematograph with a disc phonograph). to the right Professor Huguenard.Photo; 7th May 1952.
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