Telharmonium Developed By Thaddeus Cahill In 1897 . Electromechanical Instrument ...
Stockphoto ID: 2766533
File name: 73883.jpg
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Description: Telharmonium developed by Thaddeus Cahill in 1897 . Electromechanical instrument . Mary Cahill with Edwin Pierce at Washington Telharmonium keyboard 1906
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