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| All Patents in class 33/787 | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,196,703 | Aug. 29, 1916 | H. Kraut | Tool | screw adjust wrenches | |
| 1,456,938 | May 29, 1923 | A.W. Schoof | Instument for Testing and Comparing the Lead of a Screw Thread | measurement gauges | |
| 2,476,189 | Jul. 12, 1949 | E. Guetzkow | Lead Gauge for Screw Threads | milling machines | |