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| Patents for L. H. Holt | |||||
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| Number | Date | Patentee | Title | Type | |
| 179,758 | Jul. 11, 1876 | J.B. Price, C.E. Billings | Improvement in die-stocks | tap wrenches and die stocks | |
| 215,039 | May 06, 1879 | C.E. Billings | Tap Wrench | tap wrenches and die stocks | |