The record contains a module with two vacuum tube sockets that are both populated. Engraved on top of unit is "CONTROL PULSE OUTPUT". "Positive Output" is also printed on a small label at the top of the module.
Date
1951
Manufacturer
Massachusetts Institute of Technology (MIT)
Identifying Numbers
Other number
C9-4 P3
Handwritten on the paper tag on the handle.
Serial number
2
Printed printed between the vacuum tubes on the top of the module.