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History of the manufacturer  

ESS Co., Electric Service Supplies Co.; Philadelphia (PA)

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Name: ESS Co., Electric Service Supplies Co.; Philadelphia (PA)    (USA)  
Abbreviation: esscoelect
Products: Others
Summary:

E.S.S. Co., - Electric Service Supplies Co.; Philadelphia, Pennsylvania. Also New York & Chicago IL.

Trademark: Keystone

History:

This manufacturer was suggested by Wolfgang Scheida.


Some models:
Country Year Name 1st Tube Notes
USA  25 Keystone Radio Lightning Arrester   ESS Co. Keystone Radio Lightning Arrester; Made of porcelain/ceramic. 

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