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Patents

 

Interactive educational apparatus and method 5,820,386

http://www.patents.ibm.com/details?pn=US05820386__

 

Enhanced electronic dictionary 5,745,776

http://www.patents.ibm.com/details?pn=US05745776__

 

Enhanced electronic encyclopedia 5,832,472

http://www.patents.ibm.com/details?pn=US05832472__

 

 

US05832472