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| All Patents in class 346/139C | |||||
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| Number | Date | Patentee | Title | Type | |
| 665,154 | Jan. 01, 1901 | F.L. Wolfe | Pressure Recorder | steam engine indicators | |
| 1,136,648 | Apr. 20, 1915 | W.H. Bristol | Measuring Instrument | measuring apparatus | |