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74th Anniversary of Super-Sonic Flight
Two Bell X-1s and a modified B-29 on the Edwards Air Force Base, California, flight line. The X-1 was first placed into a pit then attached to the B-29. The X-1 pit is still a prominent landmark on the base. (Photo courtesy of Air Force Test Center History Office)

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Photo by: Photo courtesy of Air Force Test Center History Office |  VIRIN: 211014-F-TW412-1001.JPG