File:201A Tube characteristics.png
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Summary
| Description |
English: 201A characteristics triode valve / tube |
| Date | January 11, 1930 |
| Source | Radio Physics course 1930 |
| Author | Alfred Ghirardi |
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, 1931.
 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. |
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This work is in the public domain in its country of origin and other countries and areas where the copyright term is the author's life plus 75 years or fewer. You must also include a United States public domain tag to indicate why this work is in the public domain in the United States.
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| This file has been identified as being free of known restrictions under copyright law, including all related and neighboring rights. | |
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| Date/Time | Thumbnail | Dimensions | User | Comment | |
|---|---|---|---|---|---|
| current | 04:42, 5 March 2026 | | 1,070 × 651 (166 KB) | wikimediacommons>WhaleFarm | better scan, character recognition off |
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