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| Patents for William C. Hauff | |||||
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| Picture | Number | Date | Patentee | Title | |
 | 424,274 | Mar. 25, 1890 | D.H. Coles, J.L. Coles | Parallel Jaw Tool | |
 | 424,858 | Apr. 01, 1890 | J. Clark | Wrench | |
 | 441,977 | Dec. 02, 1890 | J.W. Riglander | Device for Mounting Countershafts | |
 | 443,869 | Dec. 30, 1890 | J.W. Riglander | Micrometer Gage | |
 | 495,386 | Apr. 11, 1893 | A.R. Weisz | Corkscrew | |