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| Patents for John D. Ihlder | |||||
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| Number | Date | Patentee | Title | Type | |
| 448,831 | Mar. 24, 1891 | R. Eickemeyer | Trolley for electric railways | ||
| 453,167 | May 26, 1891 | R. Eickemeyer | Electric Locomotive or street-car motor | ||