Nine identical cards share this catalog number. The card is a 'DBCU' card whose function is "Two-Way AND, Type A (out-of-phase load)." The card consists of resistors, capacitors, and four transistors. A program cap runs the depth of the card.
Date
Circa 1959
Manufacturer
International Business Machines (IBM). United Kingdom Ltd.
Identifying Numbers
Other number
491171
Printed with solder on the circuit side of the board
Other number
EC 109899
Engraved on the component side of the board (engineering change order?)
