Patent Drawing for O. F. Davis' Fire Escape - NARA - 6277697.jpg
en
Patent Drawing for O. F. Davis' Fire Escape NARA 6277697, 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 O. F. Davis' Fire Escape
commons
ja
O・F・デイビスのFire Escape用特許図面 NARA 6277697、米国国立公文書館管理局の特許図面、米国国立公文書館シリーズ:米国国立公文書館管理局の特許図面、画像:O・F・デイビスのFire Escape用特許図面
commons_translated
fire escape patent law patent patent right patency patented