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| Patents for J. Frederick Zimmermann | |||||
| Picture | Number | Date | Patentee | Title | |
![]() | 334,893 | Jan. 26, 1886 | E. Pement | Lathe-chuck | |
| GB-188,601,882 | Mar. 30, 1886 | E. Pement | Improvement in lathe chucks | ||