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What are T-Squares?

What are T-squares?

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t-square A T-square is a ruler, fixed at right angles to a short cross-piece that can be moved along a board to draw accurate parallel lines.
T-square in use T squares come in varying materials and sizes. Lengths of T squares include, but are not limited to, 30cm (12″), 45cm (18″), 60cm (24″), 75cm (30″), 90cm (36″) and 105cm (42″).

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