action (with the ordinary piano, the action is cocked by the depressing of the piano key), finally bringing the hammer ... Between 1887 and 1889, Welte took out patents for such an action to replace the barrels in their large orchestrions andanbsp;...
|Title||:||Player Piano: the History of the Mechanical Piano and how to Repair it|
|Author||:||Arthur W. J. G. Ord-Hume|
|Publisher||:||London : Allen & Unwin - 1970|