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 a toggle switch, 5 7-pin miniature tube sockets and 25 octal tube sockets. Many of the octal sockets are occupied by color coded glass diode modules. Five of the octal sockets have retainer rings 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. Two sockets has a long tubular widgets plugged into them.