I don't know how many of those I have specified over the years and don't ever recall that being brought up..It's a good question tho.It's funny how one takes so much in TEXT for granted.
I just happened to have a catalog with them in it and it appears this may be the answer.
CGB,,,, straight body
CGD,,,, 45 degree body
CGE,,,, 90 degree body
CGFP,,,,Wet Locations
I don't know what happened to A & C
The catalog I am looking at is a Cooper Crouse-Hinds Product Catalog 7000 Edition ,2006
dick