http://wikiless.i2p/wiki/%EB%AC%B4%EC%84%A0%EC%A0%84%EC%8B%A0%EA%B8%B0?lang=ko
(ed., Contains Radio Telephony — By E. B. Craft and E. H. Colpitts (Illustrated). Page 305 ) 외부 링크 [ 편집 ] John Joseph Fahie, A History of Wireless Telegraphy, 1838-1899: including some bare-wire proposals for subaqueous telegraphs , 1899 (first edition).