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| Patents for J. H. Millett | |||||
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| Number | Date | Patentee | Title | Type | |
| 145,726 | Dec. 23, 1873 | G.H. Crosby | Improvement in pressure-gages | steam pressure gauges | |
| 179,276 | Jun. 27, 1876 | G.H. Crosby | Improvement in Pipe Dogs or Wrenches | pipe wrenches | |
| 476,512 | Jun. 07, 1892 | C.B. Bosworth | Device for testing pressure-gauges | steam pressure gauges | |