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| Patents for Charles Elterich | |||||
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| Picture | Number | Date | Patentee | Title | |
 | 192,423 | Jun. 26, 1877 | C. Elterich | Tap Wrench | |
 | 195,997 | Oct. 09, 1877 | C. Elterich | Improvement in drill-chucks | |
 | 196,205 | Oct. 16, 1877 | C. Elterich, A.H. Briggs | Improvement in drill-chucks | |
 | 207,113 | Aug. 20, 1878 | C. Elterich, A.H. Briggs | Improvement in drill-chucks | |
 | 412,952 | Oct. 15, 1889 | C. Elterich | Tap and holder therefor | |
 | 559,372 | May 05, 1896 | C. Elterich | Tap | |
| 574,721 | Jan. 05, 1897 | C. Elterich | Thread Cutting Implement | ||