Name: StarrBoard (Wikipedia), a tapping instrument
Description: A long, flat board with multiple strings stretched over an isomorphic keyboard layout.
Wikidata: Q7602210
Invented: by John D. Starrett, patented 1985
Relations: Effectively a small electric guitar-piano hybrid
Derived instruments: harpejji
Example uses:

None that I could find other than the example tracks on the inventor's page ("At least eleven StarrBoards were built before Starrett ceased production of the instrument" suggests there might be no others really).