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