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2. Manhole cover - Wikipedia

   en.wikipedia.org/wiki/Manhole_cover

   A round manhole and its cover. A manhole cover is a removable plate forming the lid over the opening of a manhole, an opening large enough for a person to pass through that is used as an access point for an underground vault or pipe. It is designed to prevent anyone or anything from falling in, and to keep out unauthorized persons and material.

3. ISO 15398 - Wikipedia

   en.wikipedia.org/wiki/ISO_15398

   Plastic-manhole covers according to ISO 15398 are designated for the commitment on control- and inspection chambers in pedestrian (class A 15) and light vehicular areas (max. class B 125). Moreover, only manhole covers made of thermoplastics and with a maximum of DN 600 are regulated.

4. Packaged metering manhole - Wikipedia

   en.wikipedia.org/wiki/Packaged_Metering_Manhole

   Packaged metering manhole factories integrate a primary device (typically a flume [1] or weir [2]) into a fiberglass manhole. The result is a lightweight, single-piece (generally), corrosion resistant structure from which an operator can measure piped flows, take composite samples, and perform water quality parameter monitoring.

5. Sacramento’s history is underfoot. Take note of these manhole ...

   www.aol.com/sacramento-history-underfoot-note...

   The manhole cover business has turned over the years, from the sort of ornate covers that a business like Berry’s Foundry might have crafted to drabber covers that dot Sacramento’s streets today.

6. Answer Woman: Who makes the manhole covers with river ...

   www.aol.com/answer-woman-makes-manhole-covers...

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7. Manhole - Wikipedia

   en.wikipedia.org/wiki/Manhole

   Manhole covers in Helsinki, Finland. Manhole closings are protected by a grating or manhole cover, a flat plug designed to prevent accidental or unauthorized access to the manhole. These covers are traditionally made of metal, [2] but may be constructed from precast concrete, glass reinforced plastic or other composite materials (especially ...