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The Folding Ruler of Inventions

What are folding rulers?
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The 200-centimetre folding rule of inventions shows humankind’s achievements of the past 200 years. Since the Industrial Revolution, events have been happening at breakneck speed: Scientists and inventors have been presenting one invention after another for the benefit of humankind. The folding rule of inventions provides a structured overview of the history of innovations from 1800 to 2000 – on two sides!