are also known as "Line symbols, ALPHABET OF LINES, Thick dark line use to show outline of object, visible edges and surfaces., Very light and thin line use to construct layout work., Thin and dark lines use to show the size (span) of an object with a numeric value., Short dash lines use to show non visible surfaces that are not visible in an orthographic view., Long and short dash lines. Usually indicates center of holes, circles and arcs., Thin and dark line use to show the starting and ending of dimension., Extra thick lines use to show cutaway views or plane of projection where a section view is taken., Medium line with arrowhead to show notes or label for size or special information about a feature., Long line followed by two short dashes use to show alternate position of a moving part.

DIAGNOSTIC CHALLENGE!!

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