File:Norton mechanical filter.png
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Summary
| Description |
English: A mechanical filter designed using electrical network theory |
| Date | 31st May 1929 (filed) |
| Source | US patent US1792655 |
| Author | Edward Lawry Norton |
| Other versions |
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Licensing
|
The text and illustrations of US patents published before March 1, 1989 are in the public domain unless the patent text contains a specific notice that portions are copyrighted. See 37 CFR 1.71(d), 37 CFR 1.84(s)
The original patent contains no such notice, so its contents are in the public domain. Note: This only applies to images published before March 1, 1989. Patents published after that date are most likely copyrighted, unless in the public domain for another reason, such as {{PD-ineligible}}. |
Original upload log
Transferred from en.wikipedia to Commons by Wdwd using CommonsHelper.
The original description page was here. All following user names refer to en.wikipedia.
- 2009-06-25 22:30 Spinningspark 715×498× (35668 bytes) {{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}}
File history
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| Date/Time | Thumbnail | Dimensions | User | Comment | |
|---|---|---|---|---|---|
| current | 00:29, 17 January 2011 | | 715 × 498 (35 KB) | wikimediacommons>File Upload Bot (Magnus Manske) | {{BotMoveToCommons|en.wikipedia|year={{subst:CURRENTYEAR}}|month={{subst:CURRENTMONTHNAME}}|day={{subst:CURRENTDAY}}}} {{Information |Description={{en|A mechanical filter designed using electrical network theory}} |Source=Transferred from [http://en.wiki |
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