Acoustic keyboard instrument such as piano has lower plates which can be placed in open position to expose strings to audience

摘要

#CMT# #/CMT# The keyboard instrument includes an upper plate which is supported by a housing. The upper plate comprises several lower plates corresponding to respective parts of an upper opening in the housing. The lower plates can be independently changed over between an open position and a closed position. In the open position, associated parts of the strings are open to the audience. In the closed position, the strings are covered by the associated lower plates. A video or picture screen may be included. #CMT#USE : #/CMT# Piano, e.g. a grand piano with a display screen. #CMT#ADVANTAGE : #/CMT# Selective registers or octaves can be emphasized by selective removal of the lower plates. #CMT#DESCRIPTION OF DRAWINGS : #/CMT# The drawing shows a front view of the piano.