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| All Patents in class 33/512 | |||||
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| Number | Date | Patentee | Title | Type | |
| 865,350 | Sep. 10, 1907 | D. Berenberg | Measuring Apparatus | measuring apparatus | |
| 1,186,552 | Jun. 13, 1916 | F.W. Weesner, D. Cohen | Shoulder Measuring Device | special purpose gauges | |
| 1,266,977 | May 21, 1918 | F.A. Nelis | Micrometer Depth Gage | micrometer depth gauges | |
| 1,410,196 | Mar. 21, 1922 | J.A. Krivacs | Center Gauge | special purpose gauges | |