Definitions of drafting instrument
an instrument used by a draftsman in making drawings
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drafting instrument used for drawing circles
a drafting instrument resembling a compass that is used for dividing lines into equal segments or for transferring measurements
drafting instrument used to draw or measure angles
any of various triangular drafting instruments used to draw straight lines at specified angles
a square used by draftsmen to draw parallel lines
a device that requires skill for proper use