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| All Patents in class 73/1.65 | |||||
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| Picture | Number | Date | Patentee | Title | |
 | 295,093 | Mar. 11, 1884 | C.E. Ashcroft | Pressure-gage-testing apparatus | |
| 664,805 | Dec. 25, 1900 | C.B. Bosworth | Pressure-gage-testing apparatus | ||
| 664,806 | Dec. 25, 1900 | C.B. Bosworth | Testing apparatus for pressure-gages | ||
| 748,010 | Dec. 29, 1903 | S.G. Reed | Pressure Weighing Machine | ||
| 821,988 | May 29, 1906 | C.H. Craig | Gage Testing Apparatus | ||
| 1,134,316 | Apr. 06, 1915 | A.B. Collette | Testing Apparatus | ||
| 1,154,018 | Sep. 21, 1915 | F.H. Hopkins | Dead Weight Gage Tester | ||