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parallel ruler

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noun
engineering a drawing instrument in which two parallel edges are connected so that they remain parallel, although the distance between them can be varied
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Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

How to use parallel ruler in a sentence

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