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| Patents for Robert Schäfer | |||||
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| Picture | Number | Date | Patentee | Title | |
 | DE-336,765 | May 14, 1921 | R. Schäfer | Schnellspannvorrichtung als Schraubenschlüssel, Schraubstock u. dgl. | |
 | 1,382,247 | Jun. 21, 1921 | R. Schäfer | Device for operating the jaws of spanners and the like | |
 | 1,382,248 | Jun. 21, 1921 | R. Schäfer | "VELOX" | |
 | DE-340,985 | Sep. 26, 1921 | R. Schäfer | Rollgabelschlüssel | |