Veesojuzny Ordena Trudovogo Krasnogo Znameni Naucho-Issle

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Multistage helical down-hole machine with frictional coupling of wo...
- Patent number 4,585,401
- Issue date Apr 29, 1986
- Veesojuzny Ordena Trudovogo Krasnogo Znameni Naucho-Issle
- Dmitry F. Baldenko
- E21 - EARTH DRILLING MINING

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