Season 9, Episode 2 Helicopters
First Aired: January 17, 2002
Chronicling the evolution of the helicopter, which appeared in Chinese text as early as the 4th century, and was sketched by Leonardo da Vinci in 1483. Also: 20th-century prototypes; and the helicopter's increased use in combat during the Vietnam War.
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- Premiered: December 10, 1993
- Rating: TV-PG
- Premise: Architectural and engineering landmarks of the 19th and 20th centuries. The programs previously aired on A&E's `Time Machine' series. Among the subjects: the Brooklyn Bridge, the Maginot Line, the Erie Canal, the Aswan Dam and the Trans-Siberian Railroad. (more)
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