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Your Manhole Lining, Coating, Insert and Repair Expert! Concrete sanitary manholes are subject to deterioration as a result of being exposed to Hydrogen Sulfide. Can install liners in the manholes in order to extend their useful life. The manhole liners we install are SewerShield inserts made of spun composite materials. View a list of cities.
An international survey of manhole covers. Exterior of the Museum in Comacchio.
MIT Museum - Massachusetts Institute of Technology.