Two quick examples of double trademarks: Apple Records (Beatles) and Apple (Steve Jobs). They started with an agreement to stay clear of the others turf, but t

Two quick examples of double trademarks: Apple Records (Beatles) and Apple (Steve Jobs). They started with an agreement to stay clear of the others turf, but then Apple Computing got into music. I think they went to court before working something out. WWF (World Wrestling Federation vs World Wildlife Fund). They went to court and the wrestling became WWE.