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| Patents for Henry N. Pierce | |||||
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| Number | Date | Patentee | Title | Type | |
| 701,081 | May 27, 1902 | H.N. Pierce | Spool-machine | spool or bobbin machines | |
| 1,105,301 | Jul. 28, 1914 | H.N. Pierce | Self-centering boring and reaming machine for making spools | wood drilling and boring | |