An apparatus for use in teaching comprises a carrier (10,20) of information that is to form the subject-matter of a lesson; a keyboard (12) having its keys marked with symbols which include those related to the said information; a visual display unit (14) having a screen (15); a computer (13) which is...http://www.google.ca/patents/US4690644?utm_source=gb-gplus-sharePatent US4690644 - Teaching apparatus, particularly for teaching shorthand
