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| Patents for H. D. MacDonald | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,100,984 | Jun. 23, 1914 | W. Murchey | Screw-cutting tap | tapping heads and chucks | |
| 1,114,629 | Oct. 20, 1914 | W. Murchey | Device for cutting screw-threads | tapping heads and chucks | |