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| All Patents in class 33/426 | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,730,852 | Oct. 08, 1929 | W. Jenny | Angle and Hypotenuse Measuring Instrument | protractors | |
| 1,894,107 | Jan. 10, 1933 | W. Lück | Adjustable Protractor | protractors | |
| 1,983,516 | Dec. 11, 1934 | H. Ahola | Combined Protractor, Bevel Gauge, and Mitering Square | bevels | |