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«Tri-Ergon optical sound recording»
In 1922, the Tri-Ergon Light-Tone process, which inscribes sound as a light track on the edge of filmstrips, is first presented in Berlin and becomes in its time one of the leading sound-movie techniques. The name Tri-Ergon refers to its three inventors: Vogt, Massolle und Engl.
One of the first Tri-Ergon-Productions was «Weekend» by Walter Ruttmann and «Hallo! Hier Welle Erdball!» by Friedrich Bischoff and Werner Milch.