Abstract: For use in connection with coin-operated vending machines or the like having a coin lock-out coil or solenoid which accepts or rejects coins depending on whether the sole solenoid is energized or de-energized, a detector circuit comprising electromagnetic beam emitters, electromagnetic beam sensors and circuits for interpreting the received signal and determining whether the coin lock-out solenoid is to be energized, thereby accepting a coin, or de-energized, thereby rejecting a coin. The emitter is directed toward an incoming coin slot with the moving coin reflecting the beam in a particular pulsed sequence depending upon the surface characteristics and contours of the coin. The beam sensor is so located as to pick up the pulsed reflected beam from the surface of the coin, which reflections are amplified, timed and counted, and analyzed to accept or reject the coin through energizing or de-energizing the coin lock-out solenoid.

Abstract: A keyless padlock seal for shipping containers, highway trailers, railroad box cars and the like, comprising a lock body and a hasp which is spring-locked to said lock body. The hasp cannot be removed from the body without destruction of either the hasp or the body. A code-marked seal may be provided on the lock body and secured thereto in such manner that it cannot be removed or replaced without at least partial destruction of the padlock and evidence of tampering.