United States. Air Force. Cambridge Research Laboratories
Written in red ink on trace side.
overall: 1/2 in x 4 1/2 in x 6 in
Pentode and Gate module consists of a circuit board in a three sided orange frame with three miniature vacuum tubes on the component side. Handwritten text in upper left corner in pink ink reads "OK". Writing on the trace side reads "I no output II=OR DHN 11/2/59".