The object is a module with seven sockets four contain vacuum tubes of varying size. Three of the sockets are plugged. All the tubes are framed by a metal handle. In the chassis there are two power resistors and 14 phenolic circuit boards. The boards are wired to male connectors at the bottom of the chassis. Also printed on the chassis are two inspection stamps reading "K IBM" followed by a number.
Date
ca. April 1957
Manufacturer
International Business Machines (IBM)
Identifying Numbers
Other number
000174
Stamped on the chassis
Other number
3087059
Stamped on the chassis
Other number
6104
Printed on a circular paper sticker on the inside of the handle
Other number
6105
Printed on a circular paper sticker on the inside of the handle