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  1. Planimeter - Wikipedia

  2. Planimeters | National Museum of American History

  3. Polar–Other - National Museum of American History

  4. The Planimeter and the Theorem of Green - Harvard University

  5. Polar and Linear Planimeters - Wabash College

  6. Keuffel & Esser 4236 Polar Compensating Planimeter

  7. Planimeters demystified - Mechanická matematika - MENDELU

  8. Planimeter Applet Guide - hpmuseum.org

  9. 某些结果已被删除