ORIGINAL: Jim Thomerson
Think you meant 1954. The glow plug originated around 1948. The first airplane Cox 049 was the Space Bug which I had one of in 1954. then Space Bug Jr, Thermal Hopper, Babe Bee, Pee Wee, Space Hopper, RR-1, on and on. I think the two US made engines with the longest continuous production are the Fox stunt 35, and second the Babe Bee.
The Space Bug was new for '52, but Cox opened the doors in '45. To tell the truth, I wasn't aware that Cox didn't have their own engines at first! Here's all the info you could ever want on Cox engines:
http://www.mh-aerotools.de/airfoils/cox_frameset.htm