Patent Nr. 314805 (2020)
La disponibilidad del contenido es válida para Estados Unidos.
La disponibilidad del servicio y el contenido puede variar para Uruguay.
Sobre 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.
