The object is a large metal circuit carrier with a phenolic board mounted underneath. It has 9 vacuum tube sockets, 3 are populated. Various BNC jacks and a multiconductor connector are mounted on the top. The string "404 COMPARISON REGISTER" printed in red on the top and the bottom.The string "404 IN-OUT DELAY COUNTER SERIAL #21" is engraved into a black/white plastic name plate that appears to have been affixed to the top, covering the printed labeling.
Date
1951
Identifying Numbers
Serial number
21
Printed in white on the top and bottom of the object
