The ultimate manhole covers site
An organization established in 1983 in Belgium but recognized in other European countries whose main purpose is to ensure safety and quality in the construction and transportation sector.

The organization provides, among other things, the standard mark of BENOR ( )

From the organization web site:
The main objective of COPRO is to organize, coordinate, harmonize and encourage quality in the construction sector. Concretely, this objective can be realized by means of controls of quality on construction products as on their integration on sites.

The organization web site

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 15 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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