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WikiPedia: Coherer http://www.hirakawaken.com/enewrc.html http://www.marconicalling.com/museum/html/objects/... http://www.shareapic.net/347062-US-Patent-613809--... http://earlyradiohistory.us/1898sla.htm https://www.electronics-notes.com/articles/history... https://web.archive.org/web/20041210045436/http://... https://web.archive.org/web/20070927215716/http://... https://web.archive.org/web/20160303220005/http://... https://commons.wikimedia.org/wiki/Category:Cohere...