Solded in top right corner on circuit side and top left corner on component side.
overall: 3/8 in x 3 1/4 in x 4 3/4 in
"CONTROL LOGIC" is stamped on the extractor handle. The components consist of 5 DIP's and 1 capacitor on a double sided circuit board."TWENTY INVERTERS" is etched on right edge on component side. There is a tag attached that says "A91-018 resistors, Variable, Cermat trimmer, 1/2 watt" ONI/NIO is on a yellow tag on handle.