Leonid A. Kondratenko

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Podolsk, SU

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Patents Grantslast 30 patents

Information Patent Grant
Downhole screw motor
- Patent number 4,823,889
- Issue date Apr 25, 1989
- Vsesojuzny Nauchno-Issledovatelsky Institut Burovoi Tekhniki
- Dmitry F. Baldenko
- E21 - EARTH DRILLING MINING