Yantai DNG gravibus industria, Ltd. (abbreviated as DNG) sita in Yantai urbem, quod est notum ut productionem basi Sinis hydraulicarum. 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 habet history magis quam X annis, et officinas transiet in ISO9001, ISO14001 Certification et EU CE CERTIFICATION.