Patent Nr. 314805 (2020)
Finnish engineer Eric Tigerstedt solved the dilemma of sound-on-film already before the First World War. All images and sounds in this short film are produced from the surviving test materials originally created in 1914.
- Country : Finland
- Genre : Documentary
- Studio : Elokuvayhtiö Testifilmi
- Director : Mika Taanila
- Cast :