This is the IO cable box for a Bendix G15 donated by Paul Pierce. It is the interface for an IBM typewriter typically used with this system. The boards are sequenced A-D (top to bottom) and 1-14 (right to left). The wiring is sequenced A-Z (left to right). A piece of paper taped to the cover notes the date and initials of the person who modified the ANC-1 boards.
Control Data Corporation (CDC)
Stamped in ink on inside cover (top) and on outside cover (bottom).