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the first person to make an alarm clock was Levi Hutchins
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The first alarm clock only rang at 4 am
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Simon Willard made a clock called lighthouse clocks
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Antoine Redier made the first modern alarm clock
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Thomas made his own version of the alarm clock
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Alarm clock companies made portable travel alarm clocks and radio alarm clocks that allowed people to wake up to something more than a bell.
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Metals were scarce at the time, though, so most war-clocks were made of stuff similar to a reinforced egg carton, with paper and pressed wood.