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| All Patents in class 173/79 | |||||
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| Number | Date | Patentee | Title | Type | |
| 408,269 | Aug. 06, 1889 | I.E. Storey | Electric drill | portable metal boring and drilling machines | |
| 2,271,717 | Feb. 03, 1942 | A.A. Schwartz | Countersinking and blind drilling machine | drilling and boring | |