International Business Machines Corporation (IBM)
||Stamped in white at the insertion end of the board
||Stamped into the edge of two of the boards
overall: 1/4 in x 2 1/8 in x 2 1/2 in
There are three Standard Modular System (SMS) cards with an LED, mounted by two plastic brackets, at the end of each. There appears to be a part number, which is not readable beneath the LED.
Gift of Paul Pierce