A device connecting two organ keyboards so that they may be played together.
A device connecting two organ keyboards so that they may be played together.
联键音栓连接两个风琴键盘使之能够同时演奏的装置
A device connecting two organ keyboards so that they may be played together.
联键音栓连接两个风琴键盘使之能够同时演奏的装置