Crane risk control: Lifting crane driver can continuously work more than three hours, more than three hours should cease operations, 250 tons crane price, rest 1-2 hours and then carry out operations to prevent poor health, resulting from heavy injuries. Crane drivers work only after a clear command signal, to prevent injuries lifting crane brand management are: 1. Carter import excavators. Kobelco, Komatsu, Hitachi; modern; EX100WD, EX160WD, EX120, EX200-1, EX200-2, used 250 tons crane price, EX200-3, EX200-5, ZX200Komatsu PC60-7, PC120-6, PC130-7, PC200-3, Tadano 250 t crane, PC200-5, PC200-6, PC200-7, PC400-6Caterpillar CAT308B, CAT312C, 250-ton crane, CAT320A, CAT320B, CAT320C, CAT330B, CAT330C