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| Patents for David Copeland Jr. | |||||
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| Number | Date | Patentee | Title | Type | |
| 115,029 | May 23, 1871 | D. Copeland, Jr. | Improvement in cement-pipe | ||
| 115,030 | May 23, 1871 | D. Copeland, Jr. | Improvement in machines for molding drain and sewer pipes | ||