| 摘要 |
<p>The device comprises two or more tubes associated, in parallel, with a common inlet and a common outlet for their connection to the supply line of a substance to be infused, each of the said tubes having a precision gauging element, one of which has a much smaller flow that the other or others, respective tube-closure devices being associated with the tube or tubes carrying the larger-capacity gauging elements, to permit optional opening or closure thereof. <IMAGE></p> |
