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Scherchen, Herrmann. n.d. “Der Einfluß Des Mikrophons Auf Die Tönende Botschaft - Side B”.
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Anonymous,. n.d. “Demonstrations Of The „Tonlagenwandler“ - Side A”.
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Anonymous,. n.d. “Demonstrations Of The „Tonlagenwandler“ - Side B”.
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Anonymous,. n.d. “Notes About The Transmission Of News - Side A”.
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Anonymous,. n.d. “Notes About The Transmission Of News - Side B”.
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n.d. “Das Teilspektrum Der Glocke - Side A”.
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Koenig, Rudolph. n.d. “ Tuning-Fork By Dr. R. König: Ut₁ - Re₁: Re₁ 5:6”. 153,6 Vs.
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Koenig, Rudolph. n.d. “ Tuning-Fork By Dr. R. König: Mi₁ - Fa₁: Mi₁ 5:6”. 153,6 Vs.
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Koenig, Rudolph. n.d. “ Tuning-Fork By Dr. R. König: Mi₁ - Fa₁: Mi₁ 4:5”. 160 Vs.
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Koenig, Rudolph. n.d. “ Tuning-Fork By Dr. R. König: Mi₁ - Fa₁: Fa₁ 3:4”. 170,7 Vs.