The "Twin-Wheel" A-C mowers began with the #7.
All the other mowers you mention evolved from it.
In addition to differences already mentioned:
Later 80 models and all 82 models used a much heavier cage around the gear box along with a 3/4" thick instead of 5/8" thick cut bar. (Big improvement)
Early 80 models had open bearings at the ends of the connecting rods. On later models,
the bearings were enclosed with a cap.
Later 80R, 80T and all 80S and 82S mowers used ball bearings at the pivot point for the raising and lowering of the cut bar. (Another Big improvement)
The 82SI (industrial) had 2 lift cylinders; one for the mower frame and one for the cut bar.
BTW: There was also a model 82SH, another Industrial model built specifically for the Model I-40 tractor with the Industrial loader attachment.
It had all the features of the 82SI PLUS it was powered by a hydraulic motor rather than a belt.
There are probably other differences but I think I hit on the most significant ones that weren't already mentioned.
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