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| Patents for Harold F. Armstrong | |||||
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| Number | Date | Patentee | Title | Type | |
| 3,250,155 | May 10, 1966 | H.F. Armstrong | Recessing Tool | milling machine cutters | |
| 3,332,130 | Jul. 25, 1967 | H.F. Armstrong | Cutting Tool | milling machine cutters | |
| 3,550,230 | Dec. 29, 1970 | H.F. Armstrong | Cutting Tool with Chip Breaker | lathe tools | |