![Patent Nr. 314805](https://image.tmdb.org/t/p/w342/mbF9tIkUdOLVWbWrrVveIN7xzsT.jpg)
Patent Nr. 314805
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.
- Year: 2020
- Country: Finland
- Genre: Documentary
- Studio: Elokuvayhtiö Testifilmi
- Keyword: early sound film
- Director: Mika Taanila
- Cast: