1. <button id="3e77q"><tr id="3e77q"></tr></button>
      <wbr id="3e77q"><pre id="3e77q"></pre></wbr>
      <nav id="3e77q"></nav>

    2. Quality Certificate Position: Home >Quality Certificate

      In July 2002, Dongya was the first Chinese piston ring manufacturer to receive ISO/TS16949 certification. After 10 years of continuous implementation and improvement, the ISO requirements and specifications have permeated deeply into every facet of the working process, forming a quality culture of “Prevention First and Continuous Improvement”.