An electromechanical braille cell is disclosed wherein each cell includes six braille indicia formed by the free ends of six rods protruding through six openings in braille reading surface. The six rods are raised and lowered by six piezoelectric reeds. Applying an operating potential to a respective...http://www.google.fr/patents/US4473356?utm_source=gb-gplus-shareBrevet US4473356 - Electromechanical braille cell and method of operating same
Electromechanical braille cell and method of operating same
