Kawaguchi Onkai

...Also called "taishokin." Invented in the early Taisho era by Nagoya tsukikin player Kawaguchi Onkai (Jinzaburo), also known as Morita Goro. A piano keyboard was applied to a two-stringed koto, and a push button, such as that on a typewriter or cash register, was attached. By pressing the button with the left hand, the strings were pressed against a music board attached to the top, making it easy to produce a series of notes spaced by semitones.

*Some of the terminology that refers to "Kawaguchi Otomi" is listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

…〈たいしょうきん〉とも。大正の初め，名古屋の月琴奏者川口音海(仁三郎)こと森田伍郎が創案。二弦琴にピアノの鍵盤装置を応用，タイプライターないしレジスターなどの押しボタンを取り付けて，これを左手で押すことによって，弦を上部に取り付けた譜板に押し付けさせ，半音間隔の音列を容易に出すことができるようにしたもの。…

※「川口音海」について言及している用語解説の一部を掲載しています。

出典｜株式会社平凡社世界大百科事典 第２版について | 情報