申请人 |
SCHLUMBERGER CANADA LIMITED;SERVICES PETROLIERS SCHLUMBERGER;SCHLUMBERGER HOLDINGS LIMITED;SCHLUMBERGER TECHNOLOGY B.V.;SMITH INTERNATIONAL, INC.;PRAD RESEARCH AND DEVELOPMENT LIMITED |
发明人 |
CAMPBELL, JOHN;SWADI, SHANTANU N.;DEWEY, CHARLES;UTTER, ROBERT;DESAI, PRAFUL C. |