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Description Hettinger's Aerial Conductors for Wireless Signaling
Date
Source Hettinger's Aerial Conductors for Wireless Signaling US1309031
Author J. Hettinger
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Public domain
This work is in the public domain in the United States because it is a work prepared by an officer or employee of the United States Government as part of that person’s official duties under the terms of Title 17, Chapter 1, Section 105 of the US Code. Note: This only applies to original works of the Federal Government and not to the work of any individual U.S. state, territory, commonwealth, county, municipality, or any other subdivision. This template also does not apply to postage stamp designs published by the United States Postal Service since 1978. (See § 313.6(C)(1) of Compendium of U.S. Copyright Office Practices). It also does not apply to certain US coins; see The US Mint Terms of Use.
This file has been identified as being free of known restrictions under copyright law, including all related and neighboring rights.

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8 July 1919Gregorian

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Date/TimeThumbnailDimensionsUserComment
current19:39, 8 July 2019Thumbnail for version as of 19:39, 8 July 2019564 × 828 (47 KB)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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