2007TB/T 2811-2007 Overhaul gauge for No. 13A type coupler yoke
1997TB/T 2811.1-1997 No. 13 coupler frame pin hole length and frame body thickness factory repair inspection sample
TB/T 2811.1-1997 No. 13 coupler frame pin hole length and frame body thickness factory repair inspection sample was changed to TB/T 2811-2007 Overhaul gauge for No. 13A type coupler yoke.