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CPC B64F2700/6223 is a patent class for xyz.
This wiki has 2 patents in category "CPC B64F2700/6223".
Patents in category CPC B64F2700/6223
- Patent FR-1912-459266 (English title: Air-ship, Inventors: Auguste Brieussel, Filing date: 1912-08-31)
- Patent FR-1920-511270 (Filing date: 1915-05-04)