申请人 |
NATIONAL OILWELL VARCO, L.P.;MATTHIAS, TERRY RICHARD;FRANCIS, MARK J.;BROWN, SIMON J.;EMERY, KEVIN J.;ELLIS, PAUL I.;NIXON, MICHAEL SCOTT |
发明人 |
MATTHIAS, TERRY RICHARD;FRANCIS, MARK J.;BROWN, SIMON J.;EMERY, KEVIN J.;ELLIS, PAUL I.;NIXON, MICHAEL SCOTT |