File:Electrovoice-constant-directivity-horn-1975.jpg
Electrovoice-constant-directivity-horn-1975.jpg (672 × 537 pixels, file size: 42 KB, MIME type: image/jpeg)
Summary
[edit]| Description |
two sketches taken from 1978 US patent granted to D.B. Keele, Jr. of Electro-Voice for a constant-directivity horn that changed the professional audio marketplace and formed the basis for a number of other patented horns. |
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| Source | |
| Date |
1978 |
| Author |
Don Broadus Keele, Jr. |
| 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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Any user may perform this transfer; refer to Wikipedia:Moving files to Commons for details. If this file has problems with attribution, copyright, or is otherwise ineligible for Commons, then remove this tag and DO NOT transfer it; repeat violators may be blocked from editing. Other Instructions
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File history
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| Date/Time | Thumbnail | Dimensions | User | Comment | |
|---|---|---|---|---|---|
| current | 19:56, 29 December 2008 | | 672 × 537 (42 KB) | Binksternet (talk | contribs) | {{Non-free use rationale |Article=Horn speaker |Description=two sketches taken from 1978 US patent granted to D.B. Keele, Jr. of Electro-Voice for a constant-directivity horn that changed the professional audio marketplace and formed the basis for a n |
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File usage
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