This was one of the most interesting jobs that I have seen in a while. Although there was really nothing wrong with the instrument. (it needed a new string), I couldn't help myself from taking it apart to see how it worked. I never expected to see this amount of mechanical wizidry in my life. When you would push a button it would move a certain lever that was attached to a flat plate that was spring loaded to activate the motion of pressing down another set of pads that would press down the proper strings to produce the chord. UNBELIEVABLE!
I think this might have been the same guy who designed the "Titantic" That was in around 1929 too wasn't it?