A speed typing method and apparatus having multiple letters associated with each key of a keyboard. By utilizing multiple characters on each key, the number of keys would be fewer than the number of letters in the alphabet using this system. Each key on the keyboard is associated with a numerical code....http://www.google.com.tw/patents/US20030038735?utm_source=gb-gplus-share專利 US20030038735 - Speed typing apparatus and method
