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Who has never forgotten their ruler or has had problems finding it when we have needed it? Most of the time we use a pen or a pencil to trace a line. This is never that reliable because it might happen that our fingers slip or we trace the line at the side or in the wrong way. My “pen-ruler” makes it possible to be interlocked with other pens and to be able to create an auxiliary ruler enabling us to fix the problems mentioned above and to measure different lengths at the same time.
Ecole des mines de nancy