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| Patents for David A. De Long | |||||
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| Number | Date | Patentee | Title | Type | |
| 105,744 | Jul. 26, 1870 | I.H. Van Wie | Tapered Hollow Auger | hollow bits | |
| 1,434,711 | Nov. 07, 1922 | F.J. Lapointe | Manually-operated broaching machine | broaching machines | |
| 1,463,473 | Jul. 31, 1923 | F.J. Lapointe | Broaching tool | broaches | |