How a Simple Iron Box Created a Powerful Alarm
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YouTubeProto Craft
How a Simple Iron Box Created a Powerful Alarm
A deadly flood is racing toward a village, but the residents have no idea what's coming. With only minutes to act, a simple hand-cranked iron box becomes the key to saving everyone. Discover the incredible engineering behind the hand-powered air-raid siren. Using a three-stage gear system and a rotating siren wheel, this ingenious device ...
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