![Patentti Nr. 314805](https://i0.wp.com/themoviedb.org/t/p/w185/mbF9tIkUdOLVWbWrrVveIN7xzsT.jpg)
Patentti 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.
- Genuri: Documentar
- Țară: Finland
- Director: Mika Taanila
- Actori: