Various
The ultimate manhole covers site
A standard that expresses the quality of the metal. Is part of the UNI 7064 standard or similar standards in other countries
The standard includes the percentages of various materials that make up the metal component.

An example of a cover that carries the standard on the "ultimate manhole covers" site. From this lid the picture that appears in the general section was taken.
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The ultimate manhole covers site

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