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| Patents for William R. Middleton | |||||
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| Number | Date | Patentee | Title | Type | |
| 114,321 | May 02, 1871 | W.R. Middleton, E. Middleton | Improvement in barrel-machines | barrel making machines | |
| 115,974 | Jun. 13, 1871 | W.R. Middleton | Improvement in crozing-machines | barrel making machines | |