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Summary
| Description |
English: Armstrong's "feed back" drawing that convinced the patent courts to uphold his invention. |
| Date | before 1922; drawing copied from a 1922 magazine publication |
| Source | Radio Broadcast vol.1 no.1 |
| Author | Edwin H. Armstrong |
Licensing
|
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, 1930.
 Public domain works must be out of copyright in both the United States and in the source country of the work in order to be hosted on the Commons. If the work is not a U.S. work, the file must have an additional copyright tag indicating the copyright status in the source country.
Note: This tag should not be used for sound recordings. |
File history
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| Date/Time | Thumbnail | Dimensions | User | Comment | |
|---|---|---|---|---|---|
| current | 06:25, 31 March 2011 | | 679 × 488 (47 KB) | Dicklyon | {{Information |Description ={{en|1=Armstrong's "feed back" drawing that convinced the patent courts to uphold his invention.}} |Source =Radio Broadcast vol.1 no.1 |Author =Edwin H. Armstrong |Date =before 1922; drawing copied |
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