Wow 10 pages on a EGC in EMT!
As your self appointed resident code historian I will add that;
1/2" EMT (properly installed to NEC minimum) has a rating of 40 Amps as an EGC, 3/4" EMT has a rating of 60 Amps, 1" EMT = 100 Amps.
The conduit sizes were part of the equipment grounding conductor sizes from at least 1930 - 1965, what is T250.122 today.
The photo is from the 1965 NEC.
I just love stuff like that.
It's so easy to read.
Thanks for posting.