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Summary
| Description |
English: A mechanical filter for a sound reproducing apparatus and its electrical equivalent circuit. |
| Date | |
| Source | US patent US1730425 |
| Author | H. C. Harrison. Cropped and white space cleanup by SpinningSpark |
| Permission (Reusing this file) |
PD-US-PATENT-NO NOTICE. |
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.
- 2009-11-18 21:47 Spinningspark 820×688× (61735 bytes) {{Information |Description=A mechanical filter for a sound recording apparatus and its electrical equivalent circuit |Source=US patent US1730425 |Date=8th October 1929 |Author=H. C. Harrison. Cropped and white space cleanup by ~~~ |other_versions= }} ==
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| Date/Time | Thumbnail | Dimensions | User | Comment | |
|---|---|---|---|---|---|
| current | 18:59, 16 January 2011 | | 820 × 688 (60 KB) | File Upload Bot (Magnus Manske) | {{BotMoveToCommons|en.wikipedia|year={{subst:CURRENTYEAR}}|month={{subst:CURRENTMONTHNAME}}|day={{subst:CURRENTDAY}}}} {{Information |Description={{en|A mechanical filter for a sound reproducing apparatus and its electrical equivalent circuit.}} |Source= |
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