| 摘要 |
<p>707,812. Hydraulic turbines. PLUTYNSKI, A. June 25, 1951 [July 15, 1950], No. 17769/50. Class 110(3) [Also in Group XXI] At the lower end of the body F of a hydraulically operated percussive well drill is a turbine T, the outer surface of the rotor of which is provided with cutter teeth. The turbine is driven by pressure liquid that has by-passed the piston of the percussive unit.</p> |
