"विद्युतरोधी": अवतरणों में अंतर

* [httphttps://web.archive.org/web/20191025134508/https://www.insulators.info/ US Glass Insulators Reference Site]

* [https://web.archive.org/web/20090819133055/http://www.nia.org/ National Insulator Association - US site]

* [https://web.archive.org/web/20081030071522/http://www.teleramics.com/ Teleramics - specialises in UK telegraph insulators with a railway bias]

* [https://web.archive.org/web/20090820014421/http://www.myinsulators.com/downtownseattle/ One person's obsession with US telephone pole insulators]

* [https://web.archive.org/web/20091022174600/http://www.insulatorscanada.com/ Insulatorscanada]

* [https://web.archive.org/web/20090824224728/http://reference.insulators.info/patents/ Insulator Patent Reference Library] - Contains over 2,800 US patents relating to electrical insulators and related items

* [httphttps://wwwweb.archive.org/web/20091016011222/http://myinsulators.com/hungary/ Hungarian Insulators]

* [httphttps://wwwweb.archive.org/web/20190119200121/https://hemingray.net/ Online Museum for Hemingray Glass Company items]

* [https://web.archive.org/web/20190109114433/http://www.hemingray.info/ Hemingray Glass Insulator Database]