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Not every gadget was useful.
there were lots of inventions throughout history but some of them were not a really good idea. Check out some of them.
A Piano for bed
Radio Hat
Inner tube life jackets
A brush that simultaneously shines your scalp and brushes your hairy sides
Baby suspender
Hair Dryer
A glasses that you can read while you lying down
Cigarette holder for 2
The Chain Smoker
Face cover to protect from rain, snow etc