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Manual patching of large quantities of circuits requires considerable time, and is difficult to verify and awkward to change. The system described herein is an automatic patchboard capable of making 480 (or less) connections rapidly. Connections are made between two-wire inlets and outlets in any combination, and are controlled from a preprogrammed punched tape or from manual operation of a keyset on a control console. By departing from standard straight forward techniques in switching and control, a reliable nonblocking automatic patchboard became economically feasible.