sweettractors
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Exmark = 1982
Scag = 1983
Ferris = 1986
Great Dane = hard to say (website isn't specific), but I'd guess mid to late 80's when they started making ztrs
Bob-Cat = 1975
As I dug around on the various manufacturer's sites, the thought occurred to me that while they might have started building commercial quality mowers in the years they claim, chances are those were walk-behind, and 3&4 wheeled out-front riders. ZTRs all came later.
Have you ever heard of Bad Boy? Ken Sweet