Karl Dale Swartzel Jr. (June 19, 1907 April 23, 1998) was the inventor of the operational amplifier (or 'opamp'). He filed the patent for the 'summing amplifier' in 1941 when working at Bell Labs.[1]

References

  1. US 2401779, Karl D. Swartzel Jr., "Summing amplifier", published 11 June 1941, assigned to Bell Telephone Labor Inc.


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