<p>The seal comprises a tubular element controlling a reciprocating piston operating in the borehole. The drilling line has screw connections, and a suspension cable located via guides. The seal also transmits the piston travel.</p>
申请公布号
RO95114(B1)
申请公布日期
1988.08.16
申请号
RO19860122790
申请日期
1986.03.28
申请人
INSTITUTUL DE CERCETARI SI PROIECTARI PENTRU PETROL SI GAZE
