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| Patents for Useful Machinery Co. | |||||
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| Number | Date | Patentee | Title | Type | |
| 208,491 | Oct. 01, 1878 | J.W. Post | Gear Cutting Attachment for Lathes | metal lathe accessories and attachments | |
| 208,492 | Oct. 01, 1878 | J.W. Post | Key-Seat or Pinion Cutter | key seating machines | |