File:Norton mechanical filter.png
Norton_mechanical_filter.png (715 × 498 pixels, file size: 35 KB, MIME type: image/png)
Summary[edit]
Description |
A mechanical filter designed using electrical network theory |
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Source |
US patent US1792655 |
Date |
31st May 1929 (filed) |
Author | |
Permission (Reusing this file) |
See below.
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Licensing[edit]
The text and illustrations of US patents are in the public domain in the United States unless the patent text contains a specific notice that portions are copyrighted.[1][2][3]
The original patent contains no such notice, so its contents are in the public domain in the United States. |
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File history
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Date/Time | Thumbnail | Dimensions | User | Comment | |
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current | 22:30, 25 June 2009 | 715 × 498 (35 KB) | Spinningspark (talk | contribs) | {{Information |Description=A mechanical filter designed using electrical network theory |Source=US patent US1792655 |Date=31st May 1929 (filed) |Author=Edward Lawry Norton |other_versions= }} == Licensing == {{PD-US-patent}} {{KeepLocal}} |
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