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| Patents for Frithiof P. Forss | |||||
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| Picture | Number | Date | Patentee | Title | |
| 1,652,401 | Dec. 13, 1927 | F.P. Forss | Air cooling for electric drill | ||
 | 2,545,453 | Mar. 20, 1951 | F.P. Forss | Portable rotary grinder or die filer | |
 | 2,566,183 | Aug. 28, 1951 | F.P. Forss | Portable power-driven tool | |
 | 2,618,459 | Nov. 18, 1952 | F.P. Forss | Portable rotary grinder or die filer | |