The main source of my confusion are very similar markings on a multitude of tires that don't make a lot of sense to me. (mechanics.stackexchange.com)
As a U.S. trademark owner, the Foundation may enforce its rights under a statute known as the Lanham Act, or common law, to protect against the use of similar marks. (law111.com)
In both Canada and the US, an application with an earlier filing date has priority over later filed applications filed for confusingly similar marks. (slaw.ca)