IH did copy JD's corn header and got sued over it.  Even out here in grain country, the 200 rigid series were superior to the IH 800 series.  Honest IH guys around here will tell you the 15 series weren't that great and if it wasn't for the AF, they would have been what Massey or Gleaner is today. I have to kind of believe that because JD 00 series, Gleaner L series, and Massey 510s up to the 760s littered the country side and yet the 15 series almost belong in a museum since they were so rare.  We have late 715 diesel that we acquired in a round about way and its only the 3rd one I've seen and only about the 5th or so 15 series I'd ever seen.  No joke.