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| All Patents in class 73/1.81 | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,591,259 | Jul. 06, 1926 | W. Ames | Setting tool for gauges | ||
| 2,933,815 | Apr. 26, 1960 | E.T. Field, F.H. Czaplinski | Adjustable Setting Master for Dial Bore Gages | ||
| 3,336,676 | Aug. 22, 1967 | D.H. Aldeborgh | Reference Master for Dial Bore Gages | ||