an alphanumeric keyboard in which the energy required to move the combination bars into the position selected by the depression of a key is derived from the motor driving the instrument of which the keyboard forms a part Found on http://www.electropedia.org/iev/iev.nsf/display?openform&ievref=721-12-19
an alphanumeric keyboard in which the energy required to move the combination bars into the position selected by the depression of a key is derived from the motor driving the instrument of which the keyboard forms a part