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| Patents for Henry W. Caldwell | |||||
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| Number | Date | Patentee | Title | Type | |
| 203,877 | May 21, 1878 | W. Watson, H.W. Caldwell | Elevator Boot | elevators and lifts | |
| 469,451 | Feb. 23, 1892 | W. Praddex | Spirit Level | ||