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| All Patents in class 73/1.68 | |||||
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| Number | Date | Patentee | Title | Type | |
| 476,512 | Jun. 07, 1892 | C.B. Bosworth | Device for testing pressure-gauges | steam pressure gauges | |
| 748,010 | Dec. 29, 1903 | S.G. Reed | Pressure Weighing Machine | pressure indicators | |