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| Patents for Albert D. Pentz | |||||
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| Picture | Number | Date | Patentee | Title | |
| 433,304 | Jul. 29, 1890 | A.D. Pentz | Flexible Coupling | ||
 | 461,201 | Oct. 13, 1891 | A.D. Pentz | Rotary attachment for milling-machines | |
 | 461,202 | Oct. 13, 1891 | A.D. Pentz | Boring-engine | |