Category:Dual Toned Sirens: Revision history

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14 December 2013

13 December 2013

  • curprev 02:3802:38, 13 December 2013Ziginox talk contribs 222 bytes +222 Created page with "Dual-toned sirens create more than one frequency, or note, at a time. They do this by either using two rows of ports on a single stator/rotor, or by using multiple stators/rot..."