This early bicycle design called the Penny-farthing was first produced about 1870. It used an enlarged front wheel instead of gears to create greater speed and a smoother ride. It was the first machine to be called a bicycle.
This American tandem rotor, heavy-lift helicopter was first used during the Vietnam War. Powered by two 4,733 horsepower turbo-shaft engines, it has a top speed of 196 mph which made it faster than any other utility and attack helicopter at that time. It remains in production and frontline service, with over 1,200 built to date.
Originally produced by McDonnell Douglas, this Boeing twin-engine army attack helicopter first entered service with the US Army in 1984. Since then it has become the primary attack helicopter of many nations. More than 2,000 have been produced.