• 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
• 47 · crafts and industries
• 47C · industrial processes, handling of materials

47C5 · smoothing, polishing, etc. (industrial processes)

• 47C51 · smoothing, flattening (industrial process)
• 47C55 · sharpening, grinding (industrial processes)