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the T-square's edge. The T-square is used to hold other devices such as set squares or triangles. In this case, the drafter places one or more triangles of known angles on the T-square -- which is itself at right angles to the edge of the table -- and can then draw lines at any chosen angle to others on the page. Modern drafting tables are equipped with a drafting machine that is supported on both sides of the table to slide over a large piece of paper. Because it is

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