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INVENTIONS BY THE METER FOLDING RULER Non- Member Price : $22.00 Member Price : $19.80 This newest addition to our collection of historical timeline rulers features a chronological listing of the last 200 years of technological innovation. One side traces the major trends by time period for important inventions in science and technology, while the flip side highlights key events in science and technology from 1800 to 2000 with a series of black and white illustrations interspersed throughout. From the steam locomotive to electrolysis, cloning, and nanotechnology, the Inventions Rule is an informative and amusing diversion. The Inventions by the Meter folding ruler measures 2 meters open (81 inches), and 9 inches closed. Item Number: IM