• 1 · Religion and Magic
• 2 · Nature
• 3 · Human Being, Man in General
• 4 · Society, Civilization, Culture
• 5 · Abstract Ideas and Concepts
• 6 · History
• 7 · Bible
• 8 · Literature
• 9 · Classical Mythology and Ancient History

• Top
• 4 · Society, Civilization, Culture
• 49 · education, science and learning
• 49D · mathematics
• 49D5 · drawing, measuring, calculating
• 49D51 · drawing (mathematics)
• 49D511 · drawing-instruments
• 49D511(...) · drawing-instruments (with NAME)

49D511(RULER) · drawing-instruments: ruler