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