Hoeckley Oden: Actual Problems Of Telephone Switching - Quasi-Electronic Solutions For Switching Systems. In: The Telecommunication Journal of Australia. 14. Jahrgang, Nr.5/6. Telecommunication Society of Austria, Oktober 1964, S.342–355 [350, 355] (coxhill.com [PDF]): „The dry reed switch manufactured by SEL is sold under the registered name "Herkon" (hermetically sealed contact).“