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| Patents for Richard Voigtlander | |||||
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| Number | Date | Patentee | Title | Type | |
| 592,442 | Oct. 26, 1897 | J.W. von Pittler | Dynamometer | dynamometers | |
| 674,136 | May 14, 1901 | J.W. von Pittler, E. Huhn | Feed mechanism for metal-working machines | metal lathes | |