Various
The ultimate manhole covers site
Bauart-Prüfzeichen - is a standard mark issued by TÜV Rheinlan and confirms that the product has passed a series of tests confirming its safety and quality

Standard page on the Standardization Institute website https://www.tuv.com/germany/de/bauart-zeichen.html

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 3 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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