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| All Patents in class 33/472 | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,409,342 | Mar. 14, 1922 | H. Henrichs | Combined Protractor and Scale | protractors | |
| 1,411,911 | Apr. 04, 1922 | A. Desbains | Taper Gauge | measurement gauges | |