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  _7210467.JPG - Patterson Bridge - Completed in 1931.  IT pioneered pre-stressed concrete.  
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 Patterson Bridge - Completed in 1931. IT pioneered pre-stressed concrete.
Date: 7/21/09 8:04 AM | ISO: 100 | Exp. Time: 1/100s | Aperture: 3.5 | Focal Length: 38.0mm
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