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| Patents for Charles H. Trask | |||||
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| Picture | Number | Date | Patentee | Title | |
| 379,187 | Mar. 06, 1888 | C.H. Trask | Machine for Shaping Milling Tools | ||
| 414,174 | Oct. 29, 1889 | C.H. Trask | Work Holder for Milling Machines | ||
 | 422,663 | Mar. 04, 1890 | C.H. Trask | Milling-machine | |
 | 521,771 | Jun. 19, 1894 | C.H. Trask | Milling-machine | |