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| Patents for Hugh De Haven | |||||
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| Number | Date | Patentee | Title | Type | |
| 454,738 | Jun. 23, 1891 | E.F. Holmgreen | Rotary Engine | rotary steam engines | |
| 2,710,649 | Jun. 14, 1955 | H. De Haven, R.W. Griswold, II | Combination Shoulder And Lap Safety Belts | motor vehicle accessories | |