ORIGINAL: Sport_Pilot
Well of the companies listed Fox is the oldest. Goldberg is no more, just a name brand of Hobbico. Guillow's is not RC so that does not count.
I was thinking that as well but haven't checked the histories yet. Their current gas and glow engine line up is very impressive so might have to give them another shot for nostalgia's sake. The most powerful 40 I ever had was the Fox BB S-ported beast, but I never got the carb to work reliably back some 3 decades ago. I am sure they have it sorted out by now.