Abstract: A card holder assembly for holding a dialing instruction card for a paystation telephone includes a monolithic bracket that exhibits a planar forwardmost surface to which a card holder is attached. The bracket also exhibits a lateral surface oriented orthogonally to the forwardmost surface and arranged to be positioned alongside the paystation telephone. A ligamentary portion joins the lateral surface to a bracketing surface that includes a mounting notch for supporting the bracketing surface, and, thereby, the entire card holder assembly, on a mounting surface such as the rear wall of the paystation booth. A card holder, configured to have a perimeter conforming to the perimeter of the forwardmost surface, is attached to the forwardmost surface by virtue of hardware inserted through access holes that align with mounting holes in the forwardmost surface.

Abstract: An electrically nonconductive utility cable guard for use in protecting electrical riser cables from vandalism and rodent damage. The cable guard is a U-shaped open-ended channel formed of a reinforced synthetic resin material having an overall thickness of from 1/4" to 5/8". Molded to the outer edge of each side portion of the channel are short mounting tabs having apertures therein for mounting the guard to an accommodating surface such as a utility pole. In one embodiment the tabs extend from the side walls at an angle of 105.degree.. The cable guard neatly mates with underground conduit extensions due to a novel footing integrally molded to one end of the channel. The footing uses a plurality of stepped lips extending axially and radially away from the channel to mate with the ends of conduit of various sizes.

Abstract: The apparatus is slide mounted on elongated bumper support members between the grill and front bumper of a pickup truck. The apparatus is powered by a hydraulic power take-off unit which is selectively connected through a selector valve assembly to a hydraulic tool circuit, and to a series connected tension control unit and speed control valve which feed hydraulic fluid to and return it from a motor that supports a capstan. The control unit bypasses fluid away from the pump when the hydraulic pressure exceeds a maximum allowable value which corresponds to a maximum allowable pull force on the cable. The control unit includes a valve that can be manually actuated for bypassing hydraulic fluid back to the power take-off unit when the speed control valve is closed and/or it is desired to manually terminate a cable pull. Only when it is desired to pull cable is the capstan extended beyond a fender and connected to a take-up reel, with an idler pulley being raised above the reel.

Abstract: A ring-down or non-dial subscriber telephone such as a freeway emergency telephone is connected to automatic electronic switching (EAX) equipment for interconnection with an emergency operator by an interface circuit having a polarity-sensitive full-wave bridge controlling voice connection of the telephone to the operator. Actuation of the bridge is controlled by a current sensitive controller connected in series with the originating loop containing the freeway telephone. The bridge monitors the on-hook and off-hook states of the called telephone and energizes alarm circuitry upon failure of the calling telephone to go on-hook within a predetermined time after the called telephone goes on-hook. The circuit also has a capability of monitoring current flow in the originating loop containing the calling telephone and of energizing a common alarm circuit in the EAX equipment in the absence of such current flow.

Abstract: A detector for a "Black Box" toll fraud is connected to circuits at the called party's central office and comprises a relay connected in series with the called subscriber's tip (T) lead, a fraudulent call register or indicator, and a normally open time delay switch with a timer actuated by a ringing signal on the ring (R) lead, which switch closes after a predetermined delay interval (ten seconds) to cause energizing of the register. The flow of direct current in the T lead incident to the called party going off-hook energizes the relay and deactivates the switch. The control (C) lead of the central office subscriber circuit is grounded by the off-hook state of the calling party's telephone and is connected to the register by closing of the delay switch, the indication of a fraudulent call being made by the register on removal of ground from the C lead, i.e., when the calling party goes on-hook.

Abstract: A network in a four-wire communication system for verifying the source of a call seeking access to restricted telephone channels through a toll switch prior to granting such access comprises handshake circuits on the operator and subscriber sides, respectively, of the toll switch in both pairs of transmission lines, the operator input to the toll switch being on a dedicated trunk. The handshake circuits comprise two D.C. verification signal sources, the first being connectable to the transmission line pair (T lines) on the subscriber side of the toll switch, and the second being connectable to the receive line pair (TR lines) on the operator side of the toll switch. The first D.C. verification signal is applied to the T lines on completion of the dialing and is detected, in accordance with this invention, on the operator side of the toll switch by a first detector connected to the T lines in the dedicated trunk. The output of this detector causes the second D.C.

Abstract: A guard circuit is designed to be inserted in a two wire trunk between a central office and customer terminal equipment for the purpose of reducing the time period that the customer terminal equipment, for example, a private automatic branch exchange (PABX), is subject to glare. Essentially, the guard circuit monitors the various potentials of the two wire trunk from the central office. Upon release of an established connection from the central office, ground is removed from the positive line and negative potential is applied to the negative line. The guard circuit recognizes this change in potential and separates the customer terminal equipment from the central office until the customer terminal equipment is released and reconditioned. Glare cannot occur during the separation interval and thus the time period during which glare could occur is substantially reduced.