Abstract: A theft preventing device comprising a lock body, a cable member having one end fixed to the lock body and the other end fastenable to the lock body to bring the device into a locking position, and an alarm system contained in the lock body. The alarm system includes an alarm device, a drive circuit for the alarm device, and an inhibiting circuit for the drive circuit. The inhibiting circuit is completed by means of a light-conducting member extending through and along the cable member. Maximized alarming effects against various means of theft are achieved, and thus the device suitably prevents an object to be protected from being stolen.

Abstract: Ignition timing of an internal combustion engine is caused to advance in stepped increments as the engine speed increases in a uniform manner. Centrifugal weights of different sizes move a timing control element by angular increments against the action of a spring. The movement is with respect to a rotary member turning in timed relation with the crankshaft of the engine.