takram
tagtype Garage Kit ( - ,“tagtype” is a Japanese input device. The Japanese language is made of fifty syllabic characters that can be written on a matrix of ten consonants multiplied by five vowels. tagtype is designed with two rows of five buttons, a total of ten buttons that can be alternately pushed to specify the rows and columns of the fifty character matrix. When compared to the QWERTY keyboard, this formula makes typing in Japanese easier and intuitive. The input method in tagtype was used by SONY and Benesse Corporation in their commercial products.)

http://www.takram.com/projects/tagtype-garage-kit/