Changzhou Research and Trial Production Center (常州科研试制中心有限公司, also known as Keshi Group, Changzhou Development and Manufacture Centre, formerly known as the Changzhou Scientific Research and Trial Production Center) is a manufacturer and supplier of coal mine auxiliary transportation equipment. It offers explosion-proof electric vehicles, trackless rubber-wheeled cars, diesel scrapers, bracket trucks, mechanical hammer tensioners, rope pulleys, pneumatic monorail cranes, cable holder overhead passenger devices, etc.