Excilant@~Boston-@~Gp163-Baby-Grand-@~@~Piano-Made-In-2007@~@ (logan >) - N.A. - (Logan, UT)

musical instruments Improvements to musical instrument", a keying system and keyboard layout. In, he received a patent for "An Improved Concertina" for a duet keyboard systems, that included: the ability to tune the reeds externally with a watch key [...]