DEVICE FOR PROTECTION OF OBJECTS AGAINST UNAUTHORIZED ACCESS Russian patent published in 1997 - IPC

FIELD: security systems for cars, rooms, objects and areas. SUBSTANCE: device has encoded commutator, which number of codes is determined by numbers of two-pole magnetic key positions a, position and size of contact elements b, board size cd, board sign length n, number of contact elements m according to equation . In addition device has double unlock system. One part is encoded and controlled outside of object; second one is encoded or switching is controlled inside object after delay. EFFECT: increased reliability of protection. 1 dwg