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Old September 19th 09, 10:40 PM posted to alt.binaries.schematics.electronic
AnimalMagic AnimalMagic is offline
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First recorded activity by DIYBanter: Oct 2007
Posts: 11
Default Threshold of hearing - hearing threshold.pdf

On Sat, 19 Sep 2009 11:30:47 -0500, John Fields
wrote:

Enjoy!



I like the top spot item. An evacuation siren!


I find it weird that the commonly known reference source was not even
mentioned... the horn of a passing train is pretty dang loud.