An electronic device, such as an electronic learning machine or dictionary, includes a memory for storing items of information, such as words in both a first and a second language in pairs, and an operation unit for searching particular ones of the pairs of words. This device also includes a memory that...http://www.google.com/patents/US4688189?utm_source=gb-gplus-sharePatent US4688189 - Electronic equipment for storing number of searches of information
