sound mirror

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#1 Mon, 2013-07-29 04:37
SunRadio
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sound mirror

http://www.ebay.com/soc/itm/221259091084?roken=ElIaEy

nice pics...
cb
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Tue, 2017-12-12 22:56
billyx
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Sound Mirrors

The sound mirrors, also called acoustic mirrors, concrete dishes or listening ears, are vast solid structures designed as an UK Assignment Writing Service early warning system for Britain to identify enemy aircraft.