ບໍລິສັດ Yantai DNG ຢ່າງຫນັກ. (ຕົວຫຍໍ້ (ຫຍໍ້ວ່າ DNG DNG has strong technical strength and rich production experience, which specialize in producing various of hydraulic hammers and spare parts, such as chisels, pistons, front and back head, chisel bush, front bush, rod pin, bolts, and other supporting products. DNG ມີປະຫວັດສາດຫຼາຍກວ່າ 10 ປີ, ແລະໂຮງງານຜ່ານໃບຢັ້ງຢືນ ISO9001, ISO14001 ໃບຢັ້ງຢືນແລະໃບຢັ້ງຢືນອີຢູ.