• 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
• 47D · machines; parts of machines; tools and appliances
• 47D2 · machine driven by human or animal power
• 47D22 · treadmill
• 47D222 · treadmill driven by vertical device
• 47D222(+2) · treadmill driven by vertical device (+ labourers ~ crafts, industries, agriculture)

47D222(+24) · treadmill driven by vertical device (+ animals (labourers))