Abstract: A locking structure for releasably locking a covering element in a closed position on a unit housing. The locking structure includes a resiliently engaging member integrally formed on the covering element, and a supporting member pivotably connected to the covering element. The resiliently engaging member includes a pair of resilient first supports projecting from the covering element, a bar connecting the respective free ends of the resilient first supports with each other and a pair of projections formed on the bar to be releasably engaged with the housing. The supporting member includes a base plate pivotably connected to the covering element and a second support extending from the base plate to be releasably engaged with the resiliently engaging member. In a locked position of the locking structure, the bar is stably supported by the second support so that the projections are kept in engagement with the housing.

Abstract: A library apparatus having components permitting accurate and straightforward assembly. The library apparatus includes respective cell, drive, accessor and passage units, each having box shaped housings including a connection mechanism. A coupling couples the housings of the passage units with the other units. Other features of the library apparatus include a reference mark on the accessor unit which permits a transport mechanism in the passage unit to correct positional errors of the transport mechanism to other components.

Abstract: An automatic message announcement system for trains in the railroad station premises, including a train tracking circuit which tracks the location of approaching train, a trains information memory which stores information concerning each train, an edition circuit which combines the train information read out from said train information memory and a series of message patterns which include portions to be completed and which edits the message patterns to produce a series of short messages arranged sequentially according of their priority order to the content, an announcement message selection circuit which determines up to which short message among those arranged sequentially according to said priority order should be announced, in accordance with the location of the train at the time the announcement starts, and an automatic announcement system which includes a voice memory containing addressable voice segments for annoucing the message determined above.

Abstract: An automatic message announcement system for announcing the approach, arrival, and departure of vehicles such as trains at a train station. An addressable voice memory is provided for storing sequences of voice segments which are read out upon receipt of announcement command input signals to form messages for announcing that a vehicle is approaching or has arrived or is departing, with specific information such as the vehicle's destination being included in the announcement by inserting the appropriate voice segments at the proper points in the sequence. The messages are composed in such a manner that the sequences of voice segments can be altered to form shorter, but still intelligible, messages if vehicles traffic is so heavy that one message is due for announcement before the previous announcement is completed.