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| All Patents in class 409/72 | |||||
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| Number | Date | Patentee | Title | Type | |
| 166,121 | Jul. 27, 1875 | B.A. Mason | Machine for Threading Wood Screws | screw machines | |
| 1,273,904 | Jul. 30, 1918 | F. Müller | Tap Making Machine | ||
| 1,659,247 | Feb. 14, 1928 | J.A. Doane | Full Automatic Thread Hobbing Machine | thread hobbing and thread milling machines | |