2023HG/T 2821.1-2023 Rubberized polyester cords for V-belts and V-belts Part 1: Rigid cords
2013HG/T 2821.1-2013 Dipped polyester cords for V-belts and V-belts - Part 1: Rigid cords
2008HG/T 2821-2008 Dipped polyester cable cord for V-belts and V-ribbed Belts
1996HG/T 2821-1996 Dipping polyester cords for V-belts and V-belts
HG/T 2821.1-2013 Dipped polyester cords for V-belts and V-belts - Part 1: Rigid cords has been changed from HG/T 2821-2008 Dipped polyester cable cord for V-belts and V-ribbed Belts.