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The world's oldest known 'Swiss Army' knife

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The tool was found at a site called Wangen-Hinterhorn in Öhningen , a municipality on the border of Germany and Switzerland .

Measuring just 2.9 inches ( 7.3 centimeters ) long, the tool looks a bit like a small prehistoric Swiss Army knife.

The sharp-edged flint blade was fastened to a wooden handle with birch tar.