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| Patents for Helen C. Parker | |||||
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| Number | Date | Patentee | Title | Type | |
| 374,593 | Dec. 13, 1887 | A.D. Goodell | Chuck For Holding Tools With Irregular-Shaped Shanks | drill chucks | |
| 374,594 | Dec. 13, 1887 | A.D. Goodell | Drill Chuck | drill chucks | |