According to this history of American Junior Aircraft and specifically the Firebaby, the prototype appeared in 1947:

http://americanjuniorclassics.com/fi...yhistory-1.htm

Have not been able to track down the intro date of the UReely. My first successful flights occurred starting in 1953 and used a pair of Spitzy .045's on many of the scientific hollow logs. Did acquire a UReely somewhere along the line and still use it for some occasions but much prefer my simple EZJusts. Still active and proud to say I never totally abandoned Ukey for RC.

John