| 摘要 |
<p>A mechanical apparatus which includes a body which has an outer side and an inner side and at least one inlet means and at least one outlet means between the outer side and the inner side, a passage formed on the inner side which has a primary sleeve formation and at least a first secondary sleeve formation, a primary piston member which is movingly and at least partially received within the primary sleeve formation, and at least a first secondary piston member which is movingly and at least partially received within the second sleeve formation, characterised therein that the first secondary sleeve formation extends from the primary sleeve formation.</p> |
