I found this definition for harmonicon and a reference in Roget's Thesaurus under vibrating bars.

I confess I don't understand the reference to Concertina Tablature though. Tablature is useful for stringed instruments because music notation by itself may not provide enough information to properly perform a given piece. I figure concertinas are like pianos in that there is only one way to play a particular note so standard music notation is all that is needed. I've never tried to play a concertina so I may be way off base but that seems logical to me.

      - Mark