A portable electronic key easily findable even if dropped into water. The portable electronic key includes an upper cover and a lower cover, a hermetically sealed space is formed, in which electrical equipment such as a board, a battery, and an antenna are arranged. The upper cover and the lower cover are formed of foam resin, and a grain pattern is given to surfaces thereof. A specific gravity of the entire electronic key is set at 1 or less, thus enabling the portable electronic key to float on the surface of the water.

A security system having at least one electronic lock and one electronic key. The electronic lock has a memory device which can maintain the data while there is no current supplied to the memory device, and alter the data only when current is supplied, thus providing a non-continuous current drain system. The electronic lock further reduces the chance of error due to high velocity particles which can otherwise alter data in a memory device. The electronic lock applies current to the memory only when a key has been inserted in the lock, and terminates the current to the memory when the key has been removed or the function requested by the key is invalid or the function requested is completed. Alternatively, the electronic lock may apply the current to the memory only if data is to be output from or input to the memory.

Key-like portable information electronic devices and other electronic devices adapted to be inserted into mating electrical receptacles. The bodies of devices in their preferred embodiments are formed of plastic molded around a printed circuit substrate, the barrels of which, when positioned on edges of the board, are modified so as to function as electrical contacts.

The present invention essentially relates to a method for identifying a valuable object such as for example an object d'art or like work, product or object of artistic value, consisting in incorporating in an invisible manner into the said object an element provided with a code, wherein the information corresponding to the code on the element is centralized in a computer with an associated file allowing the object to be identified with certainty.

Key-like portable electronic identification devices and other electronic devices adapted to be inserted into mating electrical receptacles. The bodies of the devices in their preferred embodiments are formed of plastic molded around a printed circuit substrate, the barrels of which, when positioned on edges of the board, are modified so as to function as electrical contacts. Simplified and improved encoding is provided by a set of fusible links. Dispersal space is provided around the fusible links for fused material to prevent reformation of a fused link.