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| All Patents in class 33/514.1 | |||||
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| Number | Date | Patentee | Title | Type | |
| 146,974 | Feb. 03, 1874 | F.E. Allen | Improvement in Ring Gages for Jewelers | rules | |
| 3,336,676 | Aug. 22, 1967 | D.H. Aldeborgh | Reference Master for Dial Bore Gages | ||