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The Greeks came up with alarms in 615c.e. After they had faced a series of invasions, they came up with an "alarm" that would sound when someone would enter an area.

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βˆ™ 12y ago
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βˆ™ 5mo ago

The first mechanical alarm clock was invented by Greek philosopher Ctesibius in the 3rd century BCE. However, more modern alarm clocks that we are familiar with today were popularized in the 19th century.

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Q: When where alarms invented?
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