Schmitt Trigger 1503 C system building block
Digital Equipment Corporation (DEC)
||Printed on the solder side at the insertion end
||Engraved on the face of the aluminum frame
||Engraved on the side of the aluminum frame
overall: 1/2 in x 7 in x 4 1/2 in
The object is a board with various active and passive components surrounded by an aluminum frame and blue plastic 22 pin male connector. There are two round inspection stamps on the component side.