Teletype Incoming Line Unit 4702 system building block
Digital Equipment Corporation (DEC)
Stamped into the front of the frame and printed on the solder side.
Stamped into the side of the frame
overall: 1/2 in x 4 1/2 in x 14 in
The module consists of a printed circuit board with various components, surrounded by an aluminum frame and Blue plasic 22 pin connector. At the end of the board opposite the connector there is a single micro switch.