Various
The ultimate manhole covers site
Belgian Standards Institute responsible for planning and publishing standards in Belgium.
The institute was founded in 2003 and replaced the previous institution in Belgium IBN / BIN
The Institute is a member of ISO - International Organization for Standardization

Website of the Belgian Standards Institute https://www.nbn.be/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 1 manhole covers in the site that has this standard mark
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The ultimate manhole covers site

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