http://www.google.com/patents/US658134 http://www.google.com/patents/Us773698 http://www.google.com/patents/Us837991 http://www.google.com/patents/Us825167 And here's a link to a nice article on Whitlock and the Wurlitzer harps: http://rickcrandall.net/article16.php Cheers, Roger Wiegand http://www.carouselorgan.com/
