Permsky Filial Vsesojuznogo Nauchno-Issledovatelskogo Instituta Burovoi Tekhniki

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Articulated coupling
- Patent number 4,449,953
- Issue date May 22, 1984
- Permsky Filial Vsesojuznogo Nauchno-Issledovatelskogo Instituta Burovoi Tekhniki
- Samuil S. Nikomarov
- E21 - EARTH DRILLING MINING

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