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What is a combination square?

Invented in 1877 by Laroy S. Starrett, the founder of tool manufacturer L.S. Starrett Company, the combination square is one of the most essential and commonplace precision measuring instruments.  Developed as an improvement to the try square—a tool used to measure and mark 90-degree angles on pieces of wood—the combination square has many functions. But it’s best known for measuring and marking inside and outside angles. While it’s often associated with woodworking, the combination square is equally applicable to the work of a machinist. Combination square design The standard combination...

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