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| Patents for Edwin J. Howlett | |||||
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| Number | Date | Patentee | Title | Type | |
| 137,298 | Apr. 01, 1873 | F. Ferrin | Carriers for Lathes | metal lathe accessories and attachments | |
| 141,012 | Jul. 22, 1873 | G.T. Pillings | Milling Machines | milling machines | |