ALEXANDRIA, Va., Nov. 3 -- United States Patent no. 12,779,727, issued on Nov. 3, was assigned to Koki Holdings Co. Ltd. (Tokyo).

"Working machine" was invented by Daisuke Nemoto (Ibaraki, Japan).

According to the abstract* released by the U.S. Patent & Trademark Office: "An electric-powered tool includes a motor, a unit case, an attachment ring, a clamp shaft, a clamp spring, a tool shaft, and a clamp lever. A term "A" (N) represents a spring load of the clamp spring provided when the clamp lever is located at a first position. A term "B" (mm) represents a lever length from a center position of a support shaft to a position of the clamp lever in a front-rear direction. A term "C" (degree) represents a turning angle from the first positio...