Found at extraction end of circuit to the right of the blue clip
Found stamped in raised letters on lip of blue plastic clip
overall: 5 1/4 in x 5 in x 1/2 in
This is a circuit board with a printed copper circuit. At one end is a blue plastic pinned interface with a hinged clip. "HI. PHYSIKALISCHES INSTITUT LEHRSTUHL B T.H. AACHEN" is printed in copper to the lower right of the clip. "Cable Connector card" is printed on the top left edge of the board.