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| All Patents in class 33/806 | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,659,915 | Feb. 21, 1928 | A. Hilfiker | Caliper Attachments | measurement gauges | |
| 2,152,880 | Apr. 04, 1939 | F. Doepke, estate of (deceased), C.R. Dowdy | Thickness Gauge | measurement gauges | |
| 2,339,031 | Jan. 11, 1944 | I.D. Rosenberg | Micrometer | micrometers | |
| 3,060,584 | Oct. 30, 1962 | R. Westfall | Vernier Caliper | vernier calipers | |