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Patents for William Willis
Patents 1 - 5 of 5
First set of recordsLast set of records
3,517XMay 07, 1822W. WillisDrill, cotton thinner and ploughplows or ploughs
3,575XAug. 24, 1822W. WillisCutting box
4,575XNov. 14, 1826W. WillisTwo cylinder atmospheric steam enginesteam engines
4,980XFeb. 01, 1828W. WillisSpring teeth rack frame for the steam enginesteam engines
5,098XMay 02, 1828W. WillisSpring and valve marine propeller
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