Technology by the Metre

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This traditional folding wooden ruler is printed on both sides with 200 years of human technological achievement. On one side there is an accurate mm and cm scale along with a timeline of events - at a centimetre per year!  The other side has a matching timeline of concepts and periods, labelled in colour, so you can flip the ruler to see different information. 

Folding wooden ruler, 2 metres long,
Printed on both sides,
Graduated in centimetres and millimetres.

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