ALEXANDRIA, Va., June 19 -- United States Patent no. 12,330,204, issued on June 17, was assigned to JFE STEEL Corp. (Tokyo).

"Metal sheet punching device" was invented by Naoki Yamaguchi (Tokyo).

According to the abstract* released by the U.S. Patent & Trademark Office: "A metal sheet punching device includes: a die including a circular opening; and a punch configured to form a circular punched hole in the metal sheet supported by the die. The punch includes: a main body part; a cylindrical punching part; a rotating part disposed between the main body part and the punching part; a coated abrasive provided on an outer circumferential surface of the rotating part and configured to polish a sheared edge of the punched hole; a spring disposed...