• <thead id="f46xv"><option id="f46xv"></option></thead>
    <strike id="f46xv"></strike>
    <thead id="f46xv"><option id="f46xv"></option></thead>
    <code id="f46xv"></code><tr id="f46xv"></tr>
    <tr id="f46xv"><sup id="f46xv"></sup></tr>

      <th id="f46xv"><sup id="f46xv"></sup></th>

        <th id="f46xv"><video id="f46xv"></video></th>

        <th id="f46xv"></th>

        1. For home ★ Join collectio Chinese English
          Home News About us Installation branch Pressure testing branch Lining repairing branch Crossing department International branch Inland branch Department Customer opinion
          About us
          Manager’s remark
          Organization Structure
          · The patent certificate
          · Membership certificate
          · International authentication
          You now:Home > English > About us > Certificates > The patent certificate
          Mobile oil-free vacuum drying device patent
          Cured in Place lining for old pipeline rehabilitat
          Patent for Thick-walled HDPE pipe deformation devi
          New non-thermal desorption-type compressed air dry
          New non-thermal desorption-type compressed air pat
          New patent-pending patent
          Strengthening and repairing the casing pipe with c
          Pressure testing air exhausting device patent
          Oil entrance petroleum and sand separation device
          Page 1 of 1     1
          About us /  Customer service / Contact us Copyright ? 2010 Henan ZhongTuo Petroleum Engineering Technology Co.,Ltd All rights reserved