Frank M. Underwood |
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Page Sections
Documents |
| Date | Document Name & Details | Documents |
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| 24 December 1895 | Muffler for Engines. United States Patent US 552,085 Frank M. Underwood |  PDF - 156KB - 2 pages |
| 14 January 1896 | Sparker for Gas and Gasoline Engines United States Patent US 553,181 Frank M. Underwood | PDF - 359KB - 4 pages |