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| Patents for J. M. Ritter | |||||
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| Picture | Number | Date | Patentee | Title | |
| 415,918 | Nov. 26, 1889 | W. Meister | Plane | ||
 | 420,232 | Jan. 28, 1890 | G. Heymeier | Plane for Planing the Bottoms of Grooves in Moldings and Ornamental Woodwork | |