| 摘要 |
<p>The invention provides for a a fluid operated timer comprising an input for the fluid, reservoir means for receiving fluid from the input, actuator means responsive to the fluid pressure in the reservoir means reaching a threshold value, wherein the reservoir means comprises a plurality of reservoirs and the timer further comprises means for selectively controlling operative connection of at least one of the plurality of reservoirs to the input so that the volume of the reservoir means presented to the input fluid can be selectively varied. <IMAGE></p> |
