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| Patents for Henry E. Boyd | |||||
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| Picture | Number | Date | Patentee | Title | |
| 153,804 | Aug. 04, 1874 | H.E. Boyd | Lathe Attachments for Cutting Screw Taps | ||
| 169,080 | Oct. 26, 1875 | H.E. Boyd | Machines for Cutting Screw Taps | ||
| 392,582 | Nov. 13, 1888 | H.E. Boyd | Machine for Cutting Taps | ||