You might want to edit the part about it being the first, business mainframe. The Burroughs B5000 was published in 1961 then released I think same year as System/360. Quite forward-thinking stuff vs the giant calculator IBM made:

http://www.smecc.org/The%20Architecture%20%20of%20the%20Burr...

Burroughs changed their name to Unisys. They still sell those machines although not with the custom CPU's with hardware-enforced safety/security. (sighs)