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| Patents for Samuel Lewis Penfield | |||||
| Number | Date | Patentee | Title | Type | |
| 655,004 | Jul. 31, 1900 | S.L. Penfield | Contact Goniometer | goniometers | |
| 655,005 | Jul. 31, 1900 | S.L. Penfield | Contact Goniometer | goniometers | |