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| Patents for Henry S. Plant | |||||
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| Number | Date | Patentee | Title | Type | |
| 934,692 | Sep. 21, 1909 | H.S. Plant | Micrometer Gage | inside micrometers | |
| 1,072,493 | Sep. 09, 1913 | H.S. Plant | Micrometer Gage | micrometers | |