15 mysterious objects whose purpose was finally revealed thanks to internet users

4. Device with speaker and cord

An old hearing aid used before the advent of modern miniaturized hearing aids.

5. Plate with lots of little holes

A plate designed to present lemon slices with toothpicks so that everyone can easily help themselves

6. Capsules installed in the mountains

Devices used to trigger small controlled avalanches to prevent the accumulation of unstable snow.

7. Doors cut in two parts

Called Dutch doors, they allow only the upper part to be opened to let in air and light.

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