2020-Utility Model--A simple and reliable tool for releasing a sliding device
2020-Utility Model A release device that can be used for a single rope
2020--Utility Model--A brake device that can be used for a single rope
2020--Utility Model--A capture device that can be used as a rescue device
Utility Model of 2020 - A deceleration device that can be used as a rescue device
2020--Utility Model--A monorail slideway lowering device that uses gravity to reset
2020-Utility Model--A three-dimensional adjustable track bracket
2020 Utility Model - A pulley brake device that brakes when no one is on and releases when someone is on
