Various
Manhole Covers Site
A standard of the Mexican Federal Electricity Commission (CFE) for covers manufactured for its use.

84A is a standard used on roads for covers designed to withstand loads caused by vehicles.

This standard distinguishes between covers made of metal and those made of plastic (composite materials):
2DI00-37 is used for metal covers, while 2DI00-38 is used for covers made of composite materials.

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 11 manhole covers in the site that has this standard
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This standard can be found in the following country (in parentheses is the number of covers):
 Mexico (11)   

The ultimate manhole covers site

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