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| Patents for Christian C. Koeln | |||||
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| Number | Date | Patentee | Title | Type | |
| GB-205,396 | Oct. 18, 1923 | C.C. Koeln | Cutters for boring and like bars | boring heads | |
| CA-250,547 | Jun. 09, 1925 | C.C. Koeln | Boring tool | boring heads | |
| 1,613,174 | Jan. 04, 1927 | C.C. Koeln | Device for stoning cutters | sharpening machines | |
| 1,745,207 | Jan. 28, 1930 | C.C. Koeln, E.E. Davis | Cylinder-reboring machine | cylinder maintenance | |
| 1,768,962 | Jul. 01, 1930 | C.C. Koeln | Expansion boring tool | boring heads | |