Manhole covers by this manufacturer are made of metal and are either round or square .
Round covers intended for sidewalks are often enclosed within a square frame to facilitate paving work . This design characterizes a considerable portion of the square covers produced by this manufacturer.

No colored or gilded covers were found from this manufacturer, nor were any city emblems identified.

The function of the cover does not appear on many of the covers, although in some cases a single letter indicates its purpose: G - Gas , W - Water .
The year of manufacture usually does not appear.

Standards
The European standard EN124 and its associated load classes appear on many covers, with the most common load classes being B125 and A15 . In addition, the Polish construction mark B and the Polish certification mark IO-CERT are also found.

Typical Covers
Many of the covers feature a background pattern resembling a maze .
Concentric circles of squares are also common (usually on smaller covers), appearing frequently among other manufacturers as well, particularly on covers used for water or gas purposes . There are 11 manhole covers in the site that are made by the Manufacturer
Click for the 11 covers made by Norson (Of these, 0 are best covers)