A data storing medium comprising a substrate, a first display portion, provided on the substrate, for displaying predetermined data, the first display portion having a first recording material storing data by first recording energy, and erasing stored data of history of the use by predetermined erasing...http://www.google.es/patents/US5559314?utm_source=gb-gplus-sharePatente US5559314 - Recording medium using reversible recording material and method of processing record to recording medium
Recording medium using reversible recording material and method of ...
