1. Various grid structures and mechanical structures
2. Hydraulic props and various hydraulic equipment
3. Pressure vessels, ships, boilers
4. Petroleum extraction, refining, and transportation
5. Buildings, bridges, oxygen cylinders
1. Various grid structures and mechanical structures
2. Hydraulic props and various hydraulic equipment
3. Pressure vessels, ships, boilers
4. Petroleum extraction, refining, and transportation
5. Buildings, bridges, oxygen cylinders
