Difference amplifier 1572A system building block
The object has a green board with an aluminum frame and a blue plastic connector. On the board there are several resistors, transistors and diodes of varying colors and sizes.
Digital Equipment Corporation (DEC)
||Printed in solder near insertion end
||Stamped into the aluminum face of the frame
||Stamped into aluminum side of frame
overall: 1/4 in x 4 1/2 in x 7 in