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Smart Store - The first alarm clock could only ring at one time. Interesting fact about alarm clocks and their invention. The early prototype of an alarm clock was invented by the
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TIL : The First alarm clock could only Ring at 4am — Steemit
A 2,000-Year History of Alarm Clocks - Atlas Obscura
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PPT - The Evolution Of Clocks PowerPoint Presentation, free download - ID:2490687
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