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| Patents for Isaac D. Zitzerman | |||||
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| Picture | Number | Date | Patentee | Title | |
| 2,219,245 | Oct. 22, 1940 | I.D. Zitzerman | Crankpin Turning Tool | ||
| 2,507,846 | May 16, 1950 | I.D. Zitzerman | Crankpin Turning Tool | ||