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| Patents for Harry W. Ruppel | |||||
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| Number | Date | Patentee | Title | Type | |
| 2,300,389 | Oct. 27, 1942 | H.W. Ruppel | Coolant control and lock for spindle turrets | turret lathes | |
| 2,310,259 | Feb. 09, 1943 | H.W. Ruppel | Stock feed for automatic screw machines | screw machines | |
| 2,348,364 | May 09, 1944 | H.W. Ruppel | Turret actuating mechanism | turret lathes | |
| 2,357,428 | Sep. 05, 1944 | H.W. Ruppel | Automatic screw machine | screw machines | |