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| Patents for H. L. Parker | |||||
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| Number | Date | Patentee | Title | Type | |
| 150,890 | May 12, 1874 | A.B. Prouty | Improvement in metal-drill machines | drill presses | |
| 164,594 | Jun. 15, 1875 | A.B. Prouty | Improvement in Work-Holding Devices for Metal Planers | metal planer accessories | |