Documentary explaining how double bilateral variable area optical soundtracks are recorded onto film and played back in cinemas.
Genre: Documentary
Stars: Noel Birkin
Crew: Frank Goodliffe (Director of Photography), Donald Carter (Director)
Country: United Kingdom
Language: English
Studio: Gaumont-British Instructional
Runtime: 12 minutes
Quality: HD
Released: Jan 01, 1934
IMDb: 10
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