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US Glass Insulators Reference Site
National Insulator Association - US site
Teleramics - specialises in UK telegraph insulators with a railway bias
One person's obsession with US telephone pole insulators
Insulatorscanada
Insulator Patent Reference Library - Contains over 2,800 US patents relating to electrical insulators and related items
Hungarian Insulators
Online Museum for Hemingray Glass Company items
Hemingray Glass Insulator Database
DIN Spec regarding creepage distance
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