Today in 1933, US Patent 1899203 A was issued, an invention of Joseph Charle Auguste Labreche, for his “Combined Bottle Opener and Key Ring.” There’s no Abstract, but the simple description states that the “invention pertains to a novel combined bottle opener and key ring designed a to be carried conveniently-in the pocket.” Weird to think that this had to be patented, they seem so ubiquitous now.
My mostly used bottle opener is a Rittal key.