control of fluid power

An automated data library system including the storage of information in at least one central location and for retrieving the stored information in accordance with requests for particular stored information from a plurality of terminals, including interconnecting the terminals with the central location of stored information and transmitting requests for particular stored information at the central location and for transmitting retrieved information in accordance with the requests back to the terminals. The information is stored at a plurality of fixed locations in a plane and with the area of the plane of a particular size to provide the particular information at particular locations within the area of the plane, and including at least one sensor for retrieving the information stored at the pluralities of fixed locations in the plane. A number of X-Y positioners complementing the number of sensors are provided to provide movement of the sensors to the plurality of fixed locations in the plane. The movement of the X-Y positioner coupled to at least the one sensor is controlled in accordance with requests for particular stored information at particular locations to retrieve the particular stored information at the particular locations for transmission back to the terminals.