An automated video cassette library apparatus is provided which is actuated in response to command signals originated by an individual at a location remote from such apparatus to transfer a select video cassette in a horizontal plane from a cassette shelf to a cassette player each of which is located...http://www.google.com.hk/patents/US5434832?utm_source=gb-gplus-share專利 US5434832 - Automated cassette library apparatus for transporting a cassette along three perpendicular axes
