Kev siv cov cua compressors

1. Cua tunnel sim, underground passage ventilation, hlau smelting

2. Roj zoo fracturing

3. Coal mining los ntawm high-pressure cua blasting

4. Riam phom system, missile launch, torpedo tua

5. Submarine ups and downs, shipwreck salvage, seabed oil exploration, hovercraft

6. Tire inflation