I remember driving one of my uncles' combines aged about 13 (with him riding in the cab too) - that was a MF... google suggests it was likely an 860 with a 6-row head. Of course with all that metal behind the driver and the fact that they were rear-steer, they were quite interesting things to drive; rear visibility wasn't exactly the best! I seem to recall it being standard practice to always approach the combine from the front-left or front-right, i.e. out of the way of the cutting head but where the driver could easily see you.
No GPS or cell phones back then, of course, but I don't remember having radios either - not that it was possible to hear a damn thing in the cab anyway.
Hmm, fond memories of riding back to the stores in the full grain trailers, too - H+S probably doesn't allow that kind of thing these days :-)
Hard to do that and determine that it's a human being rather than all kinds of field critters trying to get out of the way, though.
I don't remember dead man switches on any of the farm equipment, only emergency stop switches - but maybe they have them these days.
The one that used to scare me was the potato riddler (possibly just a regional name for them?), for sorting out debris from the potatoes and knocking some of the dirt off - that was a huge clattering behemoth of a thing with open-chain drives, and workers would stick their hands into it to remove the bits that the machine had missed or to take out potatoes that were obviously no good before they made it onto the trailers.
cheers
Jules