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| All Patents in class 346/19 | |||||
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| Picture | Number | Date | Patentee | Title | |
| 1,063,281 | Jun. 03, 1913 | J.W. Motherwell | Recording-gage | ||
| 1,072,161 | Sep. 02, 1913 | A.P. Phillips | Pressure Recording Gage | ||
| 1,265,156 | May 07, 1918 | C.D. Young | Pressure Recorder | ||