Many companies involved in the early internet have entire /8 subnets: http://www.iana.org/assignments/ipv4-address-space/ipv4-addr...
I've always wondered how GE got 3.0.0.0/8, ahead of BB&N (which got three /8 assignments! - 4, 8, 46), Army (6), Xerox (13), Bell Labs (12), IBM (9), DEC (16), DoD Intel (11), US DoD (214, 215), etc.