Today in 1911, US Patent D41807 S was issued, an invention of Harry L. Beach, for his “Design for a Bottle-Opener.” There’s no Abstract, although in the description it includes this summary:

As shown in the drawing, the bottle opener has a longitudinal groove or depression, extending along the handle 1 at 2 and around the head 3 at 4. The groove or depression 2 of the handle extends from one side edge to the other. The head 3 has a transversely elongated opening 5, and the groove 4, which is narrower than the groove 2, extends around the head and from the Specification for Design.