... move long distance working in field. Features: 1. Mobile (trailer) type, completely closed structure, waterproof, dustproof, move easy. 2 ... , machine will be power off automatically. Advantages: Mobile (trailer) type, completely closed structure, waterproof, dustproof, it can move ... .ZYM-Mobile/trailer type transformer oil treatment, oil filtration machine 4.AD-Air dryer for drying electric equipments 5 ...