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| Patents for Frank P. Leffingwell | |||||
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| Number | Date | Patentee | Title | Type | |
| 175,871 | Apr. 11, 1876 | A.D. Palmer | Improvement in machines for laying out stair-rails | specialty woodworking machines | |
| 948,172 | Feb. 01, 1910 | A.D. Ide | Device for Dividing Circles or Arcs of Circles | compasses | |