The manufacturer’s covers are made of metal

 

.
The shape of the covers is rectangular

 

, square

 

, or round

 

.

No colored covers were found from this manufacturer; a single golden cover exists on the site

 

.
City emblems do not appear on the manufacturer’s covers.

The cover’s purpose often appears on the covers: water covers include the letters W

 

or SV (sluice valve)

 

, etc.
The word GAS appears on gas covers

 

.
The manufacturing year of the cover usually does not appear.

Standards
Some covers bear the British Kitemark standard

 

and the British BS5834 standard as well

 

.
The European EN124 standard and its associated load classes appear on many covers, with the most common load classes being B125 and D400

 

.

Typical covers
Most of the manufacturer’s covers feature a background of geometric shapes, mainly polygons

 

or squares

 

.
There are also diagonal covers (square or rectangular ones composed of two triangles, with the opening done by lifting one of the triangles)

 

. There are 24 manhole covers in the site that are made by the Manufacturer
Click for the 24 covers made by Thomas Dudley (Of these, 0 are best covers)