Patent Drawing for G. Marconi's Apparatus for Wireless Telegraphy - NARA - 6277803.jpg
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Patent Drawing for G. Marconi's Apparatus for Wireless Telegraphy NARA 6277803, Guglielmo Marconi, US National Archives series: Utility Patent Drawings, Images from the National Archives and Records Administration, US National Archives location: other, NARA-Author with ARC, Patent Drawing for G. Marconi's Apparatus for Wireless Telegraphy
commons
ja
G.マルコーニのワイヤレス電信用特許図面 NARA 6277803、グリエルモ・マルコーニ、米国国立公文書館シリーズ: Utility Patent Drawings、米国国立公文書館管理局の画像:他の場所、NARA-Author with ARC、G. Marconiのワイヤレス電信用特許図面
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radiotelegraph telegraphic signal marconi telegraphy wireless