Abstract: A waterproof key, particularly for locks of bath-house locker doors, which can be worn on the arm of a bathing guest, comprising a strip of material having an opening code. The material is sufficiently flexible to permit the strip to be bent to form an arm band of different diameter for encircling the arm of a wearer.

Abstract: An electrically actuatable locking device having a housing provided with an insertion channel for a card-shaped key element, at least one memory which reads the code of the key element when arranged in said housing, and, in order to increase the safety and value in use of such a locking device, an insertion element of a printer reads the information in the memory and can be introduced into the insertion channel.

Abstract: A storeroom for transport carts, particularly supermarket shopping carts and the like, having removal and return passage barriers, a money collection point for the opening of the passage barrier and a money return point upon the return of the transport cart into the storeroom, a data support associated with the transport cart and a reader for the data in the region of the removal and return passage barriers. Each cart carries its own data code and the reader of the removal passage barrier is coupled with the reader of the return passage barrier such that the reader of the removal passage barrier transmits the individual code of the cart which it has read to the reader of the return passage barrier. The latter releases the return of the money only upon the passage of that transport cart which is provided with that individual code.

Abstract: A lock provides a locking function after the insertion of a coin into it. The lock includes a punch card scanner which serves to enable the lock to provide the locking function. The lock includes a moveable bolt which is responsive to the scanner and a detent-like blocking catch. Movement of the bolt toward a locked position urges an inserted coin to lift the blocking catch, thereby freeing the bolt for further movement.

Abstract: A control apparatus for measuring usage time including an information carrier in the form of a token having magnetizable regions; the latter store information consisting of individual magnetic signals upon insertion of a coin corresponding to the time thereof. The token is interrogated in a read device upon its insertion therein.