Patent Drawing for G. Fletcher's Skate - NARA - 5928302.jpg
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Patent Drawing for G. Fletcher's Skate NARA 5928302, 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 G. Fletcher's Skate
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G.フレッチャーのスケートNARA 5928302の特許図面、米国国立公文書館管理局の特許図面、米国国立公文書館の画像:G.フレッチャーのスケートのための特許図面
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patent law patent patent right patency patented