Object Line: Thick solid line showing visible edges of an object, Hidden Line: Medium broken line showing edges not visible to the eye, Center Line: Fine broken line (long-short dashes) indicating centers of circles, arcs, or symmetrical objects, Extension Line: Fine line showing the limits of a measurement, Dimension Line: Fine line showing the size or magnitude of a measurement, Leader Line: Fine line with arrow or dot pointing to a surface for notes or dimensions, Cutting Plane Line: Thick broken line indicating an imaginary cut through an object, Section Lines: Fine patterns representing the cut surface and type of material,

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