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ASTM C478M-97
- Standard Specification for Precast Reinforced Concrete Manhole Sections [Metric]
- standard by ASTM International, 04/10/1997
- Publisher: ASTM
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1.1 This specification covers precast reinforced concrete manhole base sections, riser sections, and appurtenances such as grade rings, tops, and special sections for use in sewer and water works.