Meaning of Stillson wrench

Still'son wrench"

Pronunciation: (stil'sun), [key]
— Trademark. Trademark.
  1. a monkey wrench with a pivoted, adjustable jaw that grips pipes, bars, etc., more tightly when pressure is exerted on the handle.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
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