ALEXANDRIA, Va., Jan. 13 -- United States Patent no. 12,520,749, issued on Jan. 13, was assigned to Nanjing Chervon Industry Co. Ltd. (Nanjing, China).
"String trimmer and trimmer head" was invented by Jianpeng Guo (Nanjing, China).
According to the abstract* released by the U.S. Patent & Trademark Office: "A string trimmer includes a trimmer head and a driving device having a motor for driving the trimmer head to rotate around a rotation axis. The trimmer head includes a spool, a head housing formed with an accommodating space, and a transmission member mounted to the spool. The spool is at least partially accommodated in the accommodating space. The transmission member includes a driving portion. The head housing is formed with a mating...