Gives a whole new meaning to the term 'duet concertina', doesn't it?
Submitted by Jim Lucas
In the spirit of those before us (MacCann, Jeffries, Crane, Hayden, etc.), we have attempted to combine the best features of both the anglo and English systems into a "duet" system.
We present here the Lundberg-Lucas duet system.
P.S. That's Louise Lundberg -- SSI co-conspirator -- in the photo, with her English and my anglo.