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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. Butterworth cover - Wikipedia

    en.wikipedia.org/wiki/Butterworth_Cover

    Butterworth hatches are not the main access hatches, but are the servicing hatches, and are generally closed with a metal cover plate with a gasket that is fastened to the deck by a number of bolts which stick up from the deck. Holes on the edges of the plate fit over these bolts and the cover is fastened down with nuts or dogs.

  4. J. Stone & Co - Wikipedia

    en.wikipedia.org/wiki/J._Stone_&_Co

    J. Stone & Co was a British marine and railway engineering company based in Deptford (and later Charlton) in south east London, particularly noted for the manufacture of nails and rivets, Stone-Lloyd watertight ships' doors, brass ships' propellers, iron manhole covers, pumps, and railway carriage electric lighting and air conditioning systems.

  5. 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 ...

  6. 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 ...

  7. ISO 15398 - Wikipedia

    en.wikipedia.org/wiki/ISO_15398

    The ISO-standard ISO 15398 regulates the minimum requirements, proofs of suitability and auditing standards for manhole covers made of thermoplastics. The complete title of the norm is Specification for thermoplastics covers and frames for manholes and inspection chambers used in non-traffic areas. Issue date: 1. December 2012. The norm is in ...

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