The covers in Philadelphia are generally made of metal

 

and are usually round

 

, though square covers

 

were also found.
No colored or golden covers were found in the city, nor were any covers bearing the city’s emblem.

Some covers are designated for PECO Philadelphia, the electricity and gas company

 

, while others belong to communication companies such as Keystone Telephone Company

 

or Level 3 Communications

 

.

The purpose of some covers is unknown

 

. The function of others can be determined according to the consumer’s name: electricity (PECO Philadelphia)

 

, the word STEAM for heating or gas covers

 

, and so on.

Manufacturers
Most covers do not bear the manufacturer’s name. Among the manufacturers identified are the American company ej

 

and Clark’s Foundry, also American

 

.

Standards
No standard markings were found on the covers located in Philadelphia.