ALEXANDRIA, Va., July 16 -- United States Patent no. 12,667,940, issued on June 30.
"Engaging structure for hand tool" was invented by Tsan-Chang Lee (Taichung City, Taiwan).
According to the abstract* released by the U.S. Patent & Trademark Office: "An engaging structure includes a main body having a first side, a second side, a third side, and a fourth side. The first side is provided with a first face and a first recess. A vertical line passes the first face. The first recess is provided with a first arcuate face and a second arcuate face. The second side is provided with a second recess, a second face, and a third recess. The second recess is situated at a left side of the vertical line which passes the second face. The fourth side is...