申请人 |
SCHLUMBERGER CANADA LIMITED;SERVICES PETROLIERS SCHLUMBERGER;SCHLUMBERGER HOLDINGS LIMITED;SCHLUMBERGER TECHNOLOGY B.V.;PRAD RESEARCH AND DEVELOPMENT LIMITED;HARTOG, ARTHUR H.;THOMEER, HUBERTUS V.;POITZSCH, MARTIN E.;JEFFRYES, BENJAMIN P. |
发明人 |
HARTOG, ARTHUR H.;THOMEER, HUBERTUS V.;POITZSCH, MARTIN E.;JEFFRYES, BENJAMIN P. |