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Home > Images Dated > 2009 > September > 2 Sep 2009

Images Dated 2nd September 2009

Choose from 17 pictures in our Images Dated 2nd September 2009 collection for your Wall Art or Photo Gift. All professionally made for Quick Shipping.

Acoustic Early Warning Featured 2 Sep 2009 Image

Acoustic Early Warning

A British military sound locator in use at an airfield in southern England, 12th August 1930. The sound locator, a precursor to radar, was an acoustic early warning system, which used sound to determine the direction and elevation of enemy aircraft. On the left is a searchlight to be used in conjunction with the locator. (Photo by Hulton Archive/Getty Images)

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