File:Harrison mechanical filter.png
Size of this preview: 715 × 600 pixels. Other resolutions: 286 × 240 pixels | 572 × 480 pixels | 820 × 688 pixels.
Original file (820 × 688 pixels, file size: 60 KB, MIME type: image/png)
Captions
Captions
Add a one-line explanation of what this file represents
Summary edit
| 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 edit
|
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 edit
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= }} ==
File history
Click on a date/time to view the file as it appeared at that time.
| Date/Time | Thumbnail | Dimensions | User | Comment | |
|---|---|---|---|---|---|
| current | 18:59, 16 January 2011 | | 820 × 688 (60 KB) | File Upload Bot (Magnus Manske) (talk | contribs) | {{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= |
You cannot overwrite this file.
File usage on Commons
There are no pages that use this file.
File usage on other wikis
The following other wikis use this file:
- Usage on ar.wikipedia.org
- Usage on ast.wikipedia.org
- Usage on bg.wikipedia.org
- Usage on de.wikipedia.org
- Usage on es.wikipedia.org
- Usage on fa.wikipedia.org
- Usage on ru.wikipedia.org
