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Summary
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Excerpt from US Patent 1508424 1924-09-16, Illustration, Fig. 1, Author Thompson, G.K. (AT&T)
Image is in the public domain in the U.S. as it was published before 1927.
Licensing
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 | This work is in the public domain in the United States because it was published (or registered with the U.S. Copyright Office) before January 1, 1929. |  |
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| Date/Time | Thumbnail | Dimensions | User | Comment | |
|---|---|---|---|---|---|
| current | 17:51, 27 November 2022 | | 900 × 1,300 (156 KB) | Kbrose (talk | contribs) | Correct aspect ratio of image. |
| 16:47, 18 March 2022 |  | 728 × 1,400 (333 KB) | Kbrose (talk | contribs) | Excerpt from US Patent 1508424 1924-09-16, Illustration, Fig. 1, Author Thompson, G.K. (AT&T) Image is in the public domain in the U.S. as it was published before 1927. |
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