du Chaffaut; Benhoist A.
Patent Applications and Registrations
Patent applications and USPTO patent grants for du Chaffaut; Benhoist A..The latest application filed is for "device for guiding a drilling tool into a well and for exerting thereon a hydraulic force".
- du Chaffaut; Benhoist A. - Versailles FR
| Patent | Date |
|---|---|
| Device for guiding a drilling tool into a well and for exerting thereon a hydraulic force Grant 5,186,264 - du Chaffaut February 16, 1 | 1993-02-16 |
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