Service Bureau Corporation

The Service Bureau Corporation (SBC) had its origins in 1932 as the Service Bureau Division within IBM and was spun off as a wholly owned subsidiary in 1957 to operate IBM's burgeoning service bureau businesses. IBM had operated service bureaus in major cities beginning in the 1920s allowing users to rent time on tabulating equipment, and later computing equipment, to solve problems which couldn't justify a full-time equipment lease.

Source: Wikipedia — Service Bureau Corporation (CC BY-SA 4.0)