A printed circuit board that has been etched but not drilled. There is a liberty bell at the top of the board. There is a notch in the upper right corner. "MA7" is printed in a repeating pattern on the back of the board.
Manufacturer
Liberty bell Laboratories
Place Manufactured
Calif., U.S.A.
Identifying Numbers
Model number
RB-100
Found in the upper right corner on the right side.
