| 摘要 |
A rigid restraining tube is provided for use in manholes for restraining the sewer rod, which is used in clearing sewer obstructions, against the reaction forces which are set up when the forwardly driven sewer rod encounters the obstruction. The restraining tube is a series of short sections connected together by rigid links. Each section is split in half axially, forming a series of section halves, adapted to be wound up on opposing reels for storage and transportation. The sections of tube need not abut against each other since they are connected rigidly by the links.
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