My searches resulted in
- EB has no patent on the headstock, tuner arrangement, etc.
- they do have TMs on the headstock, tuner arrangement, etc., as noted previously
- EB has no TM on "3+1" or "4+2". There are some prior, live and dead, TMs on wordmarks containing "3+1" by other non-music companies, and cancelled/dead wordmarks of "3+1" or "4+2" alone by other non-music companies.
- EB has no patent on the headstock, tuner arrangement, etc.
- they do have TMs on the headstock, tuner arrangement, etc., as noted previously
- EB has no TM on "3+1" or "4+2". There are some prior, live and dead, TMs on wordmarks containing "3+1" by other non-music companies, and cancelled/dead wordmarks of "3+1" or "4+2" alone by other non-music companies.