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| Patents for Harold I. Southerwick | |||||
| Number | Date | Patentee | Title | Type | |
| 2,814,540 | Nov. 26, 1957 | H.I. Southerwick | Piston Packing | ||
| 2,867,409 | Jan. 06, 1959 | H.I. Southerwick | Service Jack | ||
| 2,909,358 | Oct. 20, 1959 | H.I. Southerwick | Portable Jack Assemblage | ||