Various
The ultimate manhole covers site
A Quality Mark of the German RAL group specializing in quality standards. The standard deals with the standards for installing manhole covers (sewer, etc.) in areas where there is pedestrian and vehicle traffic.

Description of the Quality Mark on the RAL Institute website https://www.ral-guetezeichen.de/pdfgz/viewer.html?file=/692/RAL-GZ_692.pdf

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
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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