User:Unfree/Plectrum piano

No successful plectrum piano exists at present, but the potential for one is indicated by the US Patent Office's classification by that name, defined as a keyboard instrument which resembles the piano in that the loudness of the tones it produces varies with the energy with which its keys are depressed, but differs from it in that the strings are activated by plucking (with plectra), rather than by striking (by hammers).