Image: US Army AF Drift Sight Mk. I on DH4
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Description: Low Height Drift Sight Mk. I mounted on the side of an Airco DH.4 in World War I
Title: US Army AF Drift Sight Mk. I on DH4
Credit: Interwar Development of Bombsights on the US Air Force Museum
Author: U.S. Air Force (more likely the US Army Air Service)
Permission: Image taken circa 1918, long ago passed into public domain regardless of source
Usage Terms: Public domain
License: Public domain
Attribution Required?: No
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