Various
The ultimate manhole covers site
Société Générale de Surveillance - An international standardization institution based in Switzerland

The institution has more than 95,000 employees in more than 2,400 offices and laboratories worldwide.

SGS web site https://www.sgs.com/

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.
There are 84 manhole covers in the site that has this standard mark
Click for all the covers with this standard

Click for the rest of the standards in the site

The ultimate manhole covers site

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