File:Gravity Aeroplane cyclogyro letterhead.png
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Letterhead image from Gravity Aeroplane's stationary, dating to 1928. PD under Pre-1978, as the original includes no copyright notice. From the web page at http://www.scripophily.net/graecone19.html
 | This work is in the public domain because it was published in the United States between 1929 and 1977 inclusive, without a copyright notice. Unless the author has been dead for several years, it is not in the public domain in countries that do not apply the rule of the shorter term for US works. This includes Canada, China (not Hong Kong, Macao, or Taiwan Area), Germany, Mexico, Switzerland, and other countries with individual treaties. See also further explanation. |  |
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| Date/Time | Thumbnail | Dimensions | User | Comment | |
|---|---|---|---|---|---|
| current | 12:37, 1 November 2007 | | 298 × 199 (20 KB) | Maury Markowitz (talk | contribs) | Letterhead image from Gravity Aeroplane's stationary, dating to 1928. PD under Pre-1978, as the original includes no copyright notice. From the web page at http://www.scripophily.net/graecone19.html {{PD-Pre1978} |
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