I think the presence of institutions like the IIHS, the safety tests done, and the importance placed on safety by consumers would simply encourage other manufac

I think the presence of institutions like the IIHS, the safety tests done, and the importance placed on safety by consumers would simply encourage other manufacturers to license the invention. Remember, at the time, manufacturers decided not to include seat belts at all, because they didn't want people to think cars weren't safe. The market is very different, now, and if there were some invention that came along that had as great an impact as the three-point belt I'm sure you would see other manufacturers license or copy it.