Various
The ultimate manhole covers site
An independent organization established in 1962 under the auspices of the Dutch government, which provides regulatory codes in the construction and infrastructure industries.
To date, 48 countries are participating in the organization.

Description of the organization from the organization’s website https://www.komoquality.com/building-quality/

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 17 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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