Cities Service disappeared. Deep Rock disappeared. Sinclair disappeared. Humble disappeared. Either these companies were bought out, or simply recast their logos.
Cities Service became "Citgo", Deep Rock became Kerr-McGee, Sinclair mutated into ARCO, Humble was absorbed by Esso or Standard or somebody.
I always wondered about "Humble Oil". That had to be a PR ploy, could you imagine any refiner caling themselves "Arrogant Oil Company"?
Sinclair Oil is now owned by a guy in Salt Lake City. They have refineries in Tulsa, OK, Casper and Rawlins, WY.
Named for Humble, TX, perhaps?