Various
The ultimate manhole covers site
A German institute founded in 1866 to monitor the health of the steam boilers that began to be used in cars. These days the institute provides inspection and control services worldwide, with more than 670,000 licenses and more than 1,000 locations worldwide.

TÜV - Technischer Überwachungsverein - Association for Technical Inspection.
SÜD - South

The home page of the organization https://www.tuvsud.com/en

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 10 manhole covers in the site that has this standard mark
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The ultimate manhole covers site

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