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| All Patents in class 409/306 | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,343,554 | Jun. 15, 1920 | W.F. Fischer | Machine for Forming Grooves | oil grooving machines | |
| 2,318,155 | May 04, 1943 | W.F. Groene, H.F. Stoffregen, Jr. | Gun rifling machine | gunsmith | |
| 2,320,750 | Jun. 01, 1943 | A. Raiche | Gun Rifling Machine | gunsmith | |