| 摘要 |
<p>A fluid dynamic piston comprises a cylindrical member 45 having a closed end 46, reinforcing means 50 extending axially from the closed end through at least a portion of the cylindrical member's axial length, the reinforcing means terminating with abutment means 37 whereby axial forces are transmitted from the cylindrical member's closed end to the abutment means. <IMAGE></p> |
