Callahan Museum Collection APH Home Page Tellatouch American Foundation for the Blind, New York ca. The keyboard has three rows of ten keys each and a standard braille keyboard on the fourth row. At the rear of the machine is a round metal plate with the braille cell in the center. The deaf-blind person rests a finger on the braille cell.
Pins rise to form the equivalent of the letter key that is struck.
The device helped end social isolation for hundreds of deaf-blind children and adults.