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| Patents for Edward P. Armstrong | |||||
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| Number | Date | Patentee | Title | Type | |
| 426,357 | Apr. 22, 1890 | E.P. Armstrong | Attachment for saw-mill | sawmill log handling | |
| 1,551,230 | Aug. 25, 1925 | E.P. Armstrong | Hand-operated circular-saw sharpener and gummer | saw sharpening machines | |
| 1,771,602 | Jul. 29, 1930 | E.P. Armstrong, R.S. Jackson | Grinder for Concave Saw Teeth | saw sharpening machines | |