What was the name of first computer in which binary numbers were used instead of decimal number?

ABC-1039

The Atanasoff-Berry Computer was the world's first electronic digital computer. It wasbuilt by John Vincent Atanasoff and Clifford Berry at Iowa State University during 1937-42. It incorporated several major innovations in computing including the use of binary arithmetic, regenerative memory, parallel processing, and separation of memory and

computing functions.