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| Patents for Richard Voigtlander | |||||
| Picture | Number | Date | Patentee | Title | |
![]() | 592,442 | Oct. 26, 1897 | J.W. von Pittler | Dynamometer | |
![]() | 674,136 | May 14, 1901 | J.W. von Pittler, E. Huhn | Feed mechanism for metal-working machines | |