Joan,  this text is copied from "Player Piano -- The History of
the Mechanical Piano and how to Repair It" (1970) by Arthur W.J.G.
Ord-Hume.

  Tomasso, A, & Son, 17 Colne Road, Winchmore Hill, London N. 21
  Clock work and street barrel-piano mfg.  Still in business (1966)
  and hiring out pianos at 4a the Broadway, palmers green, London N. 14
  In 1936 the firm was at 18-1/2 Douglas place Clerkenwell London E.C,
  from where they advertised as repairers of automatic (clockwork)
  pianos.

Also a listing for: Tomasso, Emilio, Ernesto & Phillipo

I hope this helps you in your research,

Gary G. Stevenson
South St. Louis, MO