Patent Drawing for C. G. Stevens' Boomerang - NARA - 6104275.jpg
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Patent Drawing for C. G. Stevens' Boomerang NARA 6104275, Patent drawings in the National Archives and Records Administration, US National Archives series: Utility Patent Drawings, Images from the National Archives and Records Administration, US National Archives location: other, Patent Drawing for C. G. Stevens' Boomerang
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ja
C・G・スティーヴンスの Boomerang NARA 6104275 の特許図面、米国国立公文書館管理局における特許図面、米国国立公文書館所蔵:もう1点、C・G・スティーブンスの Boomerang の特許図面
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patent law patent stevens' law patent right patency patented