US2 class 11
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Windmills were put in this class. This wiki has 2 patents in category "US2 class 11".
Patents in category US2 class 11
- Patent US-1840-1914 (English title: Improvement in windmills, Inventors: Samuel Fahrney • Isaac Garvey, Filing date: 1840-12-28)
- Patent US-1841-2107 (English title: Improvement in windmills, Inventors: William Zimmerman, Filing date: 1841-05-29)
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