File:Beardpatent.jpg
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The diagram from Beard's 1897 coupler patent.
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| Date/Time | Thumbnail | Dimensions | User | Comment | |
|---|---|---|---|---|---|
| current | 17:46, 12 January 2009 | | 349 × 435 (47 KB) | Jvv (talk | contribs) | The diagram from Beard's 1897 coupler patent. |
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