light weight, anti-corrosion, ease of operation, decrease work density, increase work efficiency ... with hydraulic oil supply outside.as the pioneer of designing and manufacturing this equipment in China,we ... easy to operate.its weight is only 40% of steel prop with same height,it reduces operater’s ... .83.83.83.8SHORING POWER(kN)3030303030INNER IAMETER OF HYDRAULIC CYLINDER(mm)Φ100Φ100Φ100Φ100Φ100RELlEF ...