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| Patents for Henry James Johnson | |||||
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| Number | Date | Patentee | Title | Type | |
| 330,901 | Nov. 24, 1885 | H.J. Johnson | Machine for forging bolt-blanks | nut or bolt making machines | |
| 335,933 | Feb. 09, 1886 | H.J. Johnson | Mechanism for Regulating Steam-Engines | steam engine governors | |