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| Patents for Harry D. Walther | |||||
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| Picture | Number | Date | Patentee | Title | |
| 3,005,229 | Oct. 24, 1961 | H.D. Walther | Rubber Mixer | ||
| 3,118,175 | Jan. 21, 1964 | H.D. Walther | Rubber Mixer and Seal in Combination Therewith | ||