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The first car was built by German inventor Karl Benz. The car had 2 wheels in the back and one in the front. This changed the world because now people were able to get to their destination by using their own fast transportation system insted of using public transportations. http://www.history.com/news/ask-history/who-built-the-first-automobile
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The first disc brake was invented by Frederick Lanchester. It was first used in the 12hp Lanchester motor car. This brake enabled cars to stop as quickly as they accelerated. http://ae-plus.com/milestones/frederick-lanchester-inventor-of-the-disc-brake
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The first car radio was created in Chicago's Galvin Manufacturing Corporation. Soon, he introduced the Motorola Radio which was the first mass-produced car radio. http://www.history.com/this-day-in-history/first-day-of-work-at-the-galvin-manufacturing-corporation
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The first air-conditioning unit in cars was created by the Packard Motor Car Company. Bishop and Babcock Co first manufactured the air conditioners. Before air conditioning in cars, people would have to roll down all four windows and go 60 mph in order to cool down. https://en.wikipedia.org/wiki/Automobile_air_conditioning
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Allen Breed first invented the sensor and safety system which was considered to be the first airbag system. He decided to create an airbag system to lower the impact of accidents so not as many people die in a car crash. The first experimental air bags were first used by the Ford Car Company.
http://www.innovateus.net/invention/airbag-0
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