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| Patents for Clem Harper | |||||
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| Number | Date | Patentee | Title | Type | |
| 443,216 | Dec. 23, 1890 | J.S. Urban, F.J. Biel | Wrench | quick adjust wrenches | |
| 451,810 | May 05, 1891 | C.D. Cowgill | Bevel Attachment for Folding Rules | rule attachments | |