This article mentions the piano having electric billows for the suction necessary to operate the piano. I had the opportunity to play a piano similar, but with

This article mentions the piano having electric billows for the suction necessary to operate the piano. I had the opportunity to play a piano similar, but with foot pump billows. It took some doing to keep it going! Although the one I played was quite old and in rough shape. It leaked air, but once it was going it was great fun.