Patent Drawing for a Propeller - NARA - 594440.jpg
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Patent Drawing for a Propeller NARA 594440, United States Patent and Trademark Office documents, US National Archives series: Patent Case Files, Images from the National Archives and Records Administration, US National Archives location: other, Patent Drawing for a Propeller
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ja
プロペラ機NARA 594440の特許図面、米国特許商標庁文書、米国国立公文書館シリーズ:特許事件簿、米国国立公文書記録管理局の画像、米国国立公文書館の位置:他の、プロペラ機のための特許図面
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patent law patent patent right propeller patency propeller (aircraft) patented