تراتونیوم
Sign in to savethumb|300px|Telefunken Volkstrautonium, 1933 (Telefunken Trautonium Ela T 42 (1933–35)) a production version of the Trautonium co-developed by Telefunken, [[Friedrich Trautwein and Oskar Sala from 1931 onwards.]]
thumb|300px|Telefunken Volkstrautonium, 1933 (Telefunken Trautonium Ela T 42 (1933–35)) a production version of the Trautonium co-developed by Telefunken, [[Friedrich Trautwein and Oskar Sala from 1931 onwards.]]