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List of American patents which issued in the mouth of April, 1842—with exemplifications

Charles M. Keller
1846 Journal of the Franklin Institute  

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doi:10.1016/0016-0032(46)90358-4 fatcat:24wrjam3xbag7lmx42y2pzneue
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Charles M. Keller. "List of American patents which issued in the mouth of April, 1842—with exemplifications." Journal of the Franklin Institute 42.5 (1846) 315-319