R. Knaffl Guitars - NARA - 50926050.jpg
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R. Knaffl Guitars NARA 50926050, Guitar patents, US National Archives series: Utility Patent Drawings, Images from the National Archives and Records Administration, US National Archives location: other, R. Knaffl Guitars
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R. Knaffl Guitars NARA 50926050、ギターの特許、米国国立公文書館シリーズ:ユーティリティの特許図面、米国国立公文書館所蔵画像:他、R. Knaffl Guitars
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