System System Building Block for the PDP-1
Digital Equipment Corporation (DEC)
Maynard, Mass., U.S.
||40962 stamped on side of frame
||4209 stamped on front of frame
||Dual FF 4209 D 00703 etched on PCB
1/2 x 7 x 4 1/2 in.
Glued label on PCB "Checks OK". Name plate on front of frame "DEC System Building Blocks".
Component/circuit board / module