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| Patents for John C. Duerr | |||||
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| Picture | Number | Date | Patentee | Title | |
 | 257,041 | Apr. 25, 1882 | J.J. Meyers | Miter box or gage | |
 | 270,313 | Jan. 09, 1883 | P. Hittel | Tool-holder for cutter-heads | |
 | 270,897 | Jan. 23, 1883 | C. Hammelmann | Fan-blower | |
 | 282,076 | Jul. 31, 1883 | C. Hammelmann | Mechanical movement for operating portable forges, blowers, &c. | |
 | 286,388 | Oct. 09, 1883 | W.R. Clarkson | Ratchet bit-brace | |