The pneumatic tube system in the CIA's first headquarters building featured more than 30 miles of 4-inch steel tubing. The system, which had about 150 receiving and dispatching stations throughout the building, operated between 1962 and 1989.
This gallery originally appeared on CBSNews.com.
February 22, 2011 12:53 PM PST
Photo by: CIA
| Caption by: Charles Cooper
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