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| All Patents in class 33/679 | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,373,367 | Mar. 29, 1921 | B. Summers | Centering Square | center squares | |
| 1,615,668 | Jan. 25, 1927 | I.A. Anderson | Laying Out Fixture and Drilling Jig | ||