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| Patents for Fred Kemper | |||||
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| Picture | Number | Date | Patentee | Title | |
 | 403,978 | May 28, 1889 | W.W. Roovers, P.G. Williams | Coin released spirometer | |
 | 412,952 | Oct. 15, 1889 | C. Elterich | Tap and holder therefor | |