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Alexei Alexeevich Efimkin — 2 Patents

Usinsk, RU: #1 of 1 inventorsTop 100%

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2 Patents All Time

Issued Patents All Time

Showing 1–2 of 2 patents

Patent #	Title	Co-Inventors	Date
6308780	Method for regaining mud circulation in operating well and device for its embodiment	—	2001-10-30
5372191	Device for removing paraffin and other deposits from the internal surface of pipes	—	1994-12-13