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herringbone gear

noun
1.
a helical gear having teeth that lie on the pitch cylinder in a V -shaped form so that one half of each tooth is on a right-handed helix and the other half on a left-handed helix.
Also called double-helical gear.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for herring bone gear

herringbone gear

noun
1.
a gearwheel having two sets of helical teeth, one set inclined at an acute angle to the other so that V-shaped teeth are formed Also called double-helical gear
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
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