This is one among the traditional ruling pens made in Germany that graphic designers used for technical drawing., Nowadays we have many more ruling
National Museum of American History
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3pcs Drawing Straight Pen Adjustable Art Ruling Pen
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Vintage Draughtsman's Set Е.О.richter Vap, Vintage Drafting Set, Calligraphy Tools, German Drafting Tools, Architectural Tools. - India
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Ruling Pen for Drawing Straight Line, Borders, Masking Fluid Koh-I-Noor for Artists, The ruling line pen is used for drawing of lines with Indian ink.
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3pcs Drawing Straight Pen Adjustable Art Ruling Pen
Ruling pen special – Handwritmic