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| Patents for John D. Hazlet | |||||
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| Number | Date | Patentee | Title | Type | |
| 450,016 | Apr. 07, 1891 | L.T. Lord, J.D. Hazlet | Taper Attachment for Lathes | metal lathe accessories and attachments | |
| 607,744 | Jul. 19, 1898 | J.D. Hazlet | Taper Attachment for Lathes | metal lathe accessories and attachments | |