| 摘要 |
<P>PROBLEM TO BE SOLVED: To easily discharge sediment accumulated in an installed reservoir pit or vertical manhole. Ž<P>SOLUTION: A fittable shovel is inserted into the reservoir pit while being deployed. The shovel is fittable thereto to catch accumulated sediment. Ž<P>COPYRIGHT: (C)2010,JPO&INPIT Ž
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