This logic module belongs to the DYSEAC computer (Second Standards Electronic Automation Computer). It is built on a long metal chassis like a box with 2 open sides and a divider down the middle.. The top of the chassis has 5 7-pin miniature tube sockets and 25 octal tube sockets. Five of the octal sockets have tube clamps above them. The bottom of the chassis has 2 large 12 blade connectors. Inside the box numerous resistors and capacitors are wired to the various sockets, along with several chassis-length bus-looking wires. Also inside the chassis are 3 octal tube sockets. One socket has a long tubular widget plugged into it.