Letter from John V. Atanasoff to R. M. Bowie of the Hygrade Sylvania Corporation regarding the purchase of vacuum tubes, July 23, 1940. The letter details a request from Atanasoff about vacuum tubes he needs to build his computing machine.
Letter from John V. Atanasoff to N. B. Krim of the Raytheon Production Corporation regarding the purchase of vacuum tubes, May 21, 1941. The letter details the type and number of tubes that Atanasoff needs to complete his computing machine.
Letter from John V. Atanasoff to N. B. Krim of the Raytheon Production Corporation regarding the purchase of vacuum tubes, July 23, 1940. The letter details the number of tubes and the voltage Atanasoff needs to complete his computing machine.
Letter from John V. Atanasoff to R. M. Bowie of the Hygrade Sylvania Corporation regarding the purchase of vacuum tubes, May 21, 1941. The letter details a request from Atanasoff for help in filling the need for vacuum tubes to be used in the construction of his computing machine.
Letter from John V. Atanasoff to R. M. Bowie of the Hygrade Sylvania Corporation regarding the purchase of vacuum tubes, January 4, 1940. The letter details the construction of a computing machine Atanasoff is building with the assistance of Mr. Berry and an inquiry about receiving a better price on vacuum tubes.