Various
The ultimate manhole covers site
A national standard of South Korea indicating that the product has been tested in its manufacturing process.

Standard description on the Korean Standards website https://www.ksa.or.kr/ksa_english/5177/subview.do

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
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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