You can reasonably assume that I am not a farmer. In fact, I am a Civil Engineer. I "do" math and am "checked out" on office equipment and the few pieces of farming hardware that I have purchased and used (trractor, disc, bush hog, scraper blade, etc.). There is a world of farming implements of which I have no knowledge and even less understanding. I will spare everyone the "trappings" of my mind in what I first thought.
What job does a Corn Jobber do? I am guessing it is similar in task to a tiller.