Bell Labs Model I Relay Calculator (Complex Number Calculator)

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Date
1940 ca.
Credit Line
Reprinted with permission of Alcatel-Lucent USA Inc.
Copyright Owner
© Lucent Technologies, Inc.
Object ID
500004321

The Complex Number Calculator, made from 450 telephone relays, could multiply and divide 8-digit numbers. The last follow-on machine, the Model VI, was completed in 1950 and ended up at the Bihar Institute of Technology in India in the 1960s.