Before revision: In the early 1900s, the Kerr company, (Kerr Manufacturing Co. of Romulus, Michigan), introduced K-type file and reamers, For this reason, these are called K-files.
After revision: In the early 1900s, the Kerr company, (Kerr Manufacturing Co. of Romulus, Michigan), introduced K type file and reamers, For this reason, these are called K-files.