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| Patents for Alfred Holmes | |||||
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| Number | Date | Patentee | Title | Type | |
| 221,479 | Nov. 11, 1879 | F.N. Trevor, W.W. Trevor | Junction Service-Boxes for Street Steam Mains | steam heating | |
| 221,480 | Nov. 11, 1879 | W.W. Trevor | Machine for Cutting Key-Seats | key seating machines | |