File:Hettinger's Aerial Conductors for Wireless Signaling US1309031A.jpg

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current19:39, 8 July 2019Thumbnail for version as of 19:39, 8 July 2019564 × 828 (47 KB)commons>Thats Just Great{{Information |description=Hettinger's Aerial Conductors for Wireless Signaling |date=July 8, 1919 |source=[https://patents.google.com/patent/US1309031 Hettinger's Aerial Conductors for Wireless Signaling US1309031] |author= J. Hettinger |permission={{PD-USGov}} |other versions= }} Category:U.S. Patent drawings

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