Abstract: An emergency vehicle proximity warning system is disclosed which includes a low power transmitter subsystem carried on board an emergency vehicle and a special purpose receiver subsystem carried on board a second vehicle. The transmitter issues a continuous stream of equally timed-spaced pulses. The receiver subsystem detects the reception or non-reception of the pulses and includes a retriggerable multivibrator having an output which assumes a first logic state when the pulses are not present and a second logic state when the pulses are present. A relay coil, which is energized only when the retriggerable multivibrator is in its second logic state, actuates a set of normally closed relay contacts which are connected into the speaker leads of the vehicle's conventional radio to interrupt the connection between the conventional vehicle radio and its speaker system when the pulses from an emergency vehicle are sensed.

Abstract: The disclosure relates to a contour transfer device which may be used to transfer contours such as those found on the bodies of automobiles so that a proper contour from one side may be transferred to an opposite side of the vehicle which has been damaged.The disclosure relating specifically to a pair of bars clamped together and with a row of finger receiving openings in which feeler and contour transfer fingers are slideably mounted laterally relative to the bars and wherein the bars are provided with frusto-conical openings in their adjacent sides in which O-rings are nested and frictionally engaged around the fingers and wherein clamp bolts clamp the bars together to compressively force the O-rings into frictional engagement with the feeler and contour transfer fingers so that the fingers may be held in a desired adjusted position.