| 摘要 |
PURPOSE: A two-way pig is provided to be capable of free moving in a pipe, and to reduce the cost of production by using urethane foam. CONSTITUTION: A two-way pig(1) is composed of a front head unit(12), a rear head unit(14), and a body unit(10) having three and more ring-shaped protrusions(16). The head units are formed at both ends of the body, and have an inclined plane.
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