The ultimate manhole covers site
An East German-era standard for cast iron lids
"Einsteigöffnungen und deren Abdeckungen in Bauwerken der unter i rdischen Versorgungsnetze. Abdeckungen aue Gußeisen".("Manhole openings and their covers in structures of underground supply networks. Covers made of cast iron".)

Description of the standard in a document from 1982

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
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The ultimate manhole covers site

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