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Invention Puzzles

 These inventions are used in the real life. 
Can you figure out what they are?

Please click on the picture to check your answers.

Clue: I'm filled with sand and my fingers can move.

Clue: I help you work with the computer.

Clue: you'll find me in the mud.

More invention challenges:
Did people invent traffic lights or cars first?
How would you prevent a chair from tipping over?