Abstract: An electro-mechanical lock which includes a housing having right and left side cavities in which a latch block may be selectively mounted to cooperatively retain a tongue extending from a door or gate which slides or swings from either the left or right side. The latch block includes a pivotable "J" latch which is engageable within a slot in the tongue extending from a gate or door to be locked as the tongue engages the "J" latch as the gate or door is closed. A latch retainer is operable to secure the latch in an engaged position with the tongue and is retractable by a solenoid or mechanical element controlled by a key operated cylinder to release the "J" latch and allow opening of the gate or door.

Abstract: A surge protection device for low level electronic systems and especially conventional roadway traffic monitoring equipment connected to embedded roadway sensors, which includes, for each sensor, first and second stage common mode and normal mode surge arrestor circuits and which stages are connected by a common mode choke in series with the sensor circuit and monitoring equipment. The first and second stage surge arrestor circuits and choke are preferably mounted on surge arrestor circuit boards having enlarged conductive traces and peripheral ground contact surfaces which enable large surge currents to pass to ground when the boards are mounted to a common grounding backplane.

Abstract: A fire suppressor having a motor and a pump affixed to a tank for the fire suppressant mountable on the back of a user and which can be changed from a spray configuration to a fill configuration for fire site vicinity filling. A fuel tank for the motor mounted on the fire suppressant tank is enclosed to prevent sparks from reaching the fuel.

Abstract: A digital control system for controlling the flow of traffic in selected directions in response to digital signals transmitted from a common transmitting control unit to multiple separate receiving traffic control units respectively associated with each controlled direction. The transmitting unit includes a transmitter and digital command code generator operative when actuated to transmit a character in the form of a digital signal specific for one of the receiving units. Each receiving unit includes traffic control indicators operative in different modes of display indications visible to traffic flowing in the direction to be controlled by that unit.