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| Patents for H. A. Johnstone | |||||
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| Number | Date | Patentee | Title | Type | |
| 381,747 | Apr. 24, 1888 | J. Young | Valve-gear | steam engine valve gear | |
| 438,740 | Oct. 21, 1890 | P. Eley | Method of and machine for tapping or connecting branches to pipes | plumber | |