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| Patents for Dahl Mfg. Co. | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,068,887 | Jul. 29, 1913 | H. Gasstrom | Rule | extensible rules | |
| 1,159,012 | Nov. 02, 1915 | H. Gasstrom | Structure Made of Relatively Movable Interlocking Sections | folding rule joints | |
| 1,288,556 | Dec. 24, 1918 | H. Gasstrom | Interlox Rule | folding rule joints | |