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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__
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