|Actually on the Appliance end with radios and TVs specifically from around 1930 until about 1970 they used serial numbers and rubber stamps on the chassis that contained the date of manufacture in it. on the fan side of things though they used 3 digit Form Numbers (2 letters and a number) until the 1940s, after that they just used serial numbers to date fans.
The 4 digit date code system you're referring to that GE (and RCA as well as they were both owned by the same company by that time which was Thomson Consumer Electronics) was in use starting in the late 1970s and they quit using that dating technique in the late 1990s, and after that GE disappeared from the Electrical/electronics world for good, Along with RCA, with the occasional reappearance of the GE and RCA badges on rebadged Chineseum Flat Panel TVs (at this point RCA and GE just exist as a name badge only the companies went belly up in the late 1990s).
I hope this helps!
Last edited on Mon Oct 21st, 2019 02:21 am by Levi Mevis