| 摘要 |
PROBLEM TO BE SOLVED: To provide a tank body of a septic tank whose design can be changed by good productivity to meet various applications. SOLUTION: In the tank body 14 of the septic tank 100, a plurality of rib-like protrusions 142 parallel to each other are formed along a vertical face intersecting at right angles the longitudinal direction X of the tank body on the inside surface of the tank body. COPYRIGHT: (C)2004,JPO
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