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| All Patents in class 33/812 | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,510,285 | Sep. 30, 1924 | W.F. Lustenberger | Calipers | measuring calipers | |
| 1,672,491 | Jun. 05, 1928 | F. Horak | Combined Rectangular Gauge and Calipers | measurement gauges | |
| 2,293,411 | Aug. 18, 1942 | W.D. Spillman | Thickness Gage | thickness gages | |
| 2,311,323 | Feb. 16, 1943 | R.H. Addis | Rivet Gage | special purpose gauges | |
| 2,807,091 | Sep. 24, 1957 | F.E. Michelson | Keyway Checkers | measurement gauges | |