T-square
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A T-square is a technical drawing instrument used by draftsmen primarily as a guide for drawing horizontal lines on a drafting table. The instrument is named after its resemblance to the letter T, wit
Drafting board with a T-square and set square
Technical drawing
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Technical drawing, drafting or drawing, is the act and discipline of composing drawings that visually communicate how something functions or is constructed.
Drafter at work
Copying technical drawings in 1973
Sketch for a government building
A drafting table