TREA

Irina Grigorievna Dobrolyubova

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  • Dnepropetrovsk, UA
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Patents Applicationslast 30 patents

  • Information Patent Application

    SEALING (PACKING) RING
    • Publication number 20130001884
    • Publication date Jan 3, 2013
    • Leonid Borisovich Dobrolyubov
    • E21 - EARTH DRILLING MINING
  • Information Patent Application

    DRILL BIT
    • Publication number 20120145465
    • Publication date Jun 14, 2012
    • Leonid Borisovich Dobrolyubov
    • E21 - EARTH DRILLING MINING