The object is a large metal circuit carrier with a phenolic board mounted underneath. It has nine vacuum tube sockets, four are populated. There are 17 BNC jacks and a multi conductor connector mounted on the top. The string "404 COMPARISON REGISTER" is printed in red on the top and the bottom. There are two indicator lights.
Date
1951
Identifying Numbers
Model number
601
Printed in white in the center of the unit and paritally obscured by black ink.
Serial number
26
Printed in white in the center of the unit and paritally obscured by black ink.