申请人 |
SCHLUMBERGER TECHNOLOGY COROPORATION;SCHLUMBERGER CANADA LIMITED;SERVICES PETROLIERS SCHLUMBERGER;SCHLUMBERGER HOLDINGS LIMITED;SCHLUMBERGER TECHNOLOGY B.V.;PRAD RESEARCH AND DEVELOPMENT LIMITED |
发明人 |
ATKINSON, MALCOLM;HANSEN, KLAUS, BRINCK;THERON, BERNARD, E.;NIGHSWANDER, JOHN, ALLAN |