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| Patents for Chicago Mortising Machine Co. | |||||
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| Number | Date | Patentee | Title | Type | |
| 363,123 | May 17, 1887 | C.H. Douglas | Chain cutter for mortising-machines | mortising machines | |
| 374,946 | Dec. 20, 1887 | C.H. Douglas | Chain mortising machine | mortising machines | |
| 379,566 | Mar. 20, 1888 | C.H. Douglas | Chain mortising machine | mortising machines | |