3 Bit Shift Register with Buffer Register 4230 C System Building Blocks
Digital Equipment Corporation (DEC)
||Etched on metal frame on top.
||Stamped in ink on circuit side at bottom.
overall: 10 1/8 in x 4 1/2 in x 1/2 in
Printed circuit board in an aluminum frame with many components that include: resistors; transistors and capacitors. "4230" etched on frame. "March 31, 1975" is stamped in ink on component side.