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| Patents for Parker H. Sweet Jr. | |||||
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| Picture | Number | Date | Patentee | Title | |
 | 171,789 | Jan. 04, 1876 | T.P. Franke | Pipe Cutter | |
 | 314,390 | Mar. 24, 1885 | D.E. MacCarthy | Cone Mandrel | |
 | 363,508 | May 24, 1887 | F.H. Anderson, H.P. Holt, F.W. Crossley | Pendulum Governor for Gas Motor Engines | |