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| Patents for William B. Hale | |||||
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| Picture | Number | Date | Patentee | Title | |
 | 91,117 | Jun. 08, 1869 | N.B. Hadley | Improvement in machines for threading screws | |
 | 388,760 | Aug. 28, 1888 | N.S. Clement | Dovetailing-machine | |
 | 479,518 | Jul. 26, 1892 | C.H. Lockwood | Leveling Instrument | |