Two identical cards share this catalog number. The card is a 'DBH' card whose function is unknown. The module consists of two rows of components, jumpers, and three transistors (one of which is mounted on a red anodized aluminum heat sink).
Date
Circa 1959
Manufacturer
International Business Machines Corporation (IBM)
Identifying Numbers
Other number
111054
Engraved on the conmponent side of the card (engineering part number?)
Other number
3 25
Written in red felt-tip pen on the component side of the card; the '3' is upside-down.
Other number
49317
Written with solder on the circuit side of the card
