In MMDigest 160117, Bill Koenigsberg has started what I am sure will
be an interesting and informative thread concerning Duo-Art test rolls.

I feel I should comment on the launch date of the Duo-Art, which
Bill thought was perhaps at some time in 1913; it is my understanding,
however, that the Duo-Art was launched in March 1914.  Indeed, the
Player Piano Group here in the UK, the world's oldest society devoted
to mechanical music, marked the centenary with a special presentation
and concert at our 2014 AGM [Annual General Meeting].

Best wishes to all from the UK,
Rowland Lee