 The optophonic piano Wladimir Baranoff-RossinSee Baranoff-Rossin 's official web page started building his optophonic piano in the 1915s.
<clarity>  The optophonic piano Wladimir Baranoff-RossinSee Baranoff-Rossin 's official web page started building his optophonic piano in the 1915s.
 The optophonic piano Wladimir Baranoff-RossinSee Baranoff-Rossin started building his optophonic piano in the 1915s.