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| All Patents in class 33/577 | |||||
| Number | Date | Patentee | Title | Type | |
| 1,302,131 | Apr. 29, 1919 | R.L. Carter | Centering-gage | center marking gauges | |
| 1,615,668 | Jan. 25, 1927 | I.A. Anderson | Laying Out Fixture and Drilling Jig | ||