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| Patents for John Hertzler | |||||
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| Number | Date | Patentee | Title | Type | |
| 604,678 | May 24, 1898 | H.B. Keiper | Ball-retainer for antifriction-bearings | industrial machine bearings | |
| D28,868 | Jun. 14, 1898 | H.B. Keiper | Design for a ball-retainer | metalworking machine mechanisms | |