Sirene: Perbedaan antara revisi

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* {{en}}[http://physics.kenyon.edu/EarlyApparatus/Acoustics/Siren/siren.htm Siren]
* {{en}}[http://www.jmarcoz.com/sirens/sirenarchive.htm Sirenarchive]
* {{en}}[http://whistlemuseum.com/2008/11/07/german-torpedo--siren-whistle-c-1905-1939.aspx German torpedo-siren whistle] {{Webarchive|url=https://web.archive.org/web/20091013131233/http://whistlemuseum.com/2008/11/07/german-torpedo--siren-whistle-c-1905-1939.aspx |date=2009-10-13 }}
* [http://www.tempointeraktif.com/share/?act=TmV3cw==&type=UHJpbnQ=&media=bmV3cw==&y=JEdMT0JBTFNbeV0=&m=JEdMT0JBTFNbbV0=&d=JEdMT0JBTFNbZF0=&id=MTQzNzYy Tempo Interaktif: Sumatra Barat Uji Coba Sirene Tsunami Pagi Ini]