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2
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A thin line used to indicate the center of a symmetrical object.
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3
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90 degree angle.
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4
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Heavy, dashed lines used to show sectional views. Arrows are extended from the endpoints to illustrate the viewing direction.
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6
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Thin lines normally drawn between two extension lines, with arrows or ticks at the end and a dimension at the center.
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8
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A thin line used to indicate the center of a round object in a primary (true-shape) view.
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9
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Light lines used to project dimension lines to specific points on an object.
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10
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The heaviest lines used in drafting, serving as 'frame' for a drawing and established a space between the drawing and the edge of the paper.
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11
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Very light lines used as guides for lettering a drawing.
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12
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A collection of the different lines used in drafting, with classifications for line weight (thickness) and linetype.
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14
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Thin lines made up of long and short dashes, used to indicate alternate positions for moving parts, repeated details, or motion paths.
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15
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Thin lines used when drawing inside features of an object exposed by a cutting plane. Lines are drawn using patterns corresponding to different materials.
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