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| All Patents in class 346/123 | |||||
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| Number | Date | Patentee | Title | Type | |
| 603,391 | May 03, 1898 | F.L. Wolfe | Pressure-recorder | steam pressure gauges | |
| 665,154 | Jan. 01, 1901 | F.L. Wolfe | Pressure Recorder | steam engine indicators | |
| 677,674 | Jul. 02, 1901 | C.J. Manning | Recording Gage of Steam Pressure on Boilers | steam pressure gauges | |
| 785,677 | Mar. 21, 1905 | C.J. Manning | Recording Gage | industrial recording apparatus | |