Abstract: An automatic call distribution (ACD) interface unit (AIU) which receives event messages generated by different telecommunication switches and forwards corresponding event messages to management of information system (MIS) processors. The AIU insures the uniqueness of identification codes by substituting a modified identification code when event messages destined for a single MIS processor are generated by two or more telecommunication switches.

Abstract: An electro-hydraulic steering system for vehicles such as roller type surface compacting machines which have a steerable ground-engaging unit at each end of the chassis. The system combines a conventional orbital type steering valve, two conventional solenoid actuated hydraulic valves and two conventional lock valves with an electric control circuit that includes simple console-mounted selector switches, a foot pedal-controlled switch and a simple cam-actuated switch that is automatically actuated in consequence of shifting the control lever of the vehicle's transmission from "forward" to "reverse" and vice versa, in a manner which gives the operator unprecedented flexibility in his choice of steering mode.