Abstract: A system for the locking and/or unlocking of a security device, particularly an automobile locking device, comprising a transmitting device for transmitting coded data recording, a receiving device for receiving the coded data recording, a transmitter-end storage and a receiver-end storage for storing codes and a comparator for comparing the received data recording with the stored data recording, a control signal being adapted to be given off to the security device from the receiving device in the event that said data agree. The receiving device has a signal generator to produce several further coded data which are stored in the transmitting device and in the receiving device and can be employed upon the subsequent use of the system. The further coded data recording may be random number and/or algorithms for changing the random numbers. The production of the further coded data recording is effected preferably upon actuation of the ignition lock.

Abstract: An ignition key consists of two structural units which are detachably connected to each other. One of the structural units contains the transmitter electronics and the key shank, while the other structural unit contains the battery and a button for connecting the battery to the transmitter electronics. The attachment of the two structural parts to each other is effected by means of dovetail guides.

Abstract: An apparatus for controlling the traveling speed of a motor vehicle with an electrical control unit acted upon by a speed dependent signal, which unit compares the then present actual speed with a desired speed fed into a storage memory unit, and upon a deviation of the actual speed from the desired speed, a deviation signal dependent on the magnitude of the deviation is transmitted to a control stage, the latter influencing the ratio of the fuel-air mixture which is fed to the vehicle motor, as well as a manual operatively switchable circuit for acceleration of the vehicle to the desired driving speed stored in the storage memory unit. A differentiating stage is provided an input which is fed with the speed dependent signal. The output signal of the differentiating unit influences the deviation signal directly or indirectly in the sense of a decrease (compared to a deviation signal were the differentiating unit absent).