Looking at both the Wurlitzer roll changer and the Aeolian Concertola,
I have noticed some very striking similarities in both design and
function.  It got me wondering if there was some connection between the
two machines.  So,  I have come up with a list of questions that I hope
will stimulate discussion on the subject.

1.  Who built the Aeolian Concertola roll changers?  Did Aeolian build
them in their own machine shops or did they come from an outside
source?

2.  Did Aeolian license the patents held by Wurlitzer on their roll
changers?  The revolving carousel, the wire rod and the way the machine
"grabs" the wire hooked onto the music roll and pulls it over the
tracker bar and onto the take-up spool is nearly identical to the way
the Wurlitzer machine works.  This seems too coincidental.

3.  Has anyone searched for and found any patents held by Aeolian and
Wurlitzer for their respective roll changers?

4.  What are the Aeolian Concertolas constructed out of?  Brass plated
steel?  Solid brass?  Gold plated brass or steel?

5.  It is my understanding that the Wurlitzer roll changer was invented
by someone independent of the Wurlitzer Company and that Wurlitzer
purchased the device and its patents (and claimed it as it's own
invention).  Who was this and does anyone know anything about him/them?

Thanks,
Dave Krall