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ISO 2594:1972
M00001095
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ISO 2594:1972 Building drawings -- Projection methods
standard by International Organization for Standardization, 09/01/1972
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Two methods are defined and the symbols specified as shown in the figures. The direct orthogonal projection is symbolized by two parallel arrows running vertically to a dash-and-dot line, and the mirror-inverted orthogonal projection by two parallel double arrows running vertically to a dash-and-dot line.