File:Tone mixer of the Telharmonium, used to generate different instrumental qualities, Cabot St Music Plant, Holyoke, Massachusetts.png
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![File:Tone mixer of the Telharmonium, used to generate different instrumental qualities, Cabot St Music Plant, Holyoke, Massachusetts.png](https://upload.wikimedia.org/wikipedia/commons/thumb/5/57/Tone_mixer_of_the_Telharmonium%2C_used_to_generate_different_instrumental_qualities%2C_Cabot_St_Music_Plant%2C_Holyoke%2C_Massachusetts.png/516px-Tone_mixer_of_the_Telharmonium%2C_used_to_generate_different_instrumental_qualities%2C_Cabot_St_Music_Plant%2C_Holyoke%2C_Massachusetts.png?20211105144149)
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