Invention Grant
- Patent Title: Variable-pitch propeller
- Patent Title (中): 可变螺距螺旋桨
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Application No.: US31825519Application Date: 1919-08-18
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Publication No.: US1415756APublication Date: 1922-05-09
- Inventor: ZOOK DAVID F
- Applicant: ZOOK DAVID F
- Assignee: David F Zook
- Current Assignee: David F Zook
- Priority: US31825519 1919-08-18
- Main IPC: B64C11/36
- IPC: B64C11/36
Information query
