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The first dryer invented was a large metal drums with ventilation holes, powered by hand cranks, and used over open fires. It was made in England and France in the late 18th and early 19th centuries.
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American inventor, George T. Sampson came up with a better ventilator-type dryer. It had a rack and used heat from a stove, rather than an open fire.
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Inventor J. Ross Moore installed a stove and hung the clothes there to dry.
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Hamilton Manufacturing and other companies like GE started selling over 60,000 gas and electric dryers annually.
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Dryer manufacturers moved controls to the front of the dryer, added a timer, an exhaust for moist air, temperature controls and a cool-down cycle.
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Manufacturers put electric starters on gas dryer and then microelectronic controls were put on dryers to time drying cycles.
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The dryer today is way more advanced than it was then. Now you can time your clothes and there are sensors and many more advanced things.