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| Patents for Ernst C. Heydenreich | |||||
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| Number | Date | Patentee | Title | Type | |
| 455,101 | Jun. 30, 1891 | E.C. Heydenreich | Tool Holder | tool holders | |
| 475,560 | May 24, 1892 | E.C. Heydenreich | Plug-Cutter | hollow bits | |