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| All Patents in class 33/700 | |||||
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| Number | Date | Patentee | Title | Type | |
| 434,531 | Aug. 19, 1890 | E. Thomson | Induction Discharge Protector for Welding Appatatus | welding apparatus | |
| 1,192,089 | Jul. 25, 1916 | A. Meldrum | Gage | measurement gauges | |
| 3,367,612 | Feb. 06, 1968 | C.A. Usiskin | Adjustible Indicator Holder | test indicator holders | |
| 3,628,498 | Dec. 21, 1971 | A.H. Kleinsorge | Optical Reader Assembly | optical measuring gauges | |