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| Patents for Charles L. Alden | |||||
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| Number | Date | Patentee | Title | Type | |
| 384,336 | Jun. 12, 1888 | W. Ross, G. Ross | Water-engine valve | ||
| 454,051 | Jun. 16, 1891 | W.P. Kellogg | Adjustable stop for boring-machines | portable timber borers | |