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| Description |
English: William Macewen (1848-1924) demonstrating his triangle to a group which includes Lane, Hirschfelder, Barkan, Stillman. |
| Date | Unknown date |
| Source | http://ihm.nlm.nih.gov/images/B17743 |
| Author | Unknown author |
"The National Library of Medicine believes this item to be in the public domain."
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This work is in the public domain in its country of origin and other countries and areas where the copyright term is the author's life plus 70 years or fewer.  You must also include a United States public domain tag to indicate why this work is in the public domain in the United States.
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| Date/Time | Thumbnail | Dimensions | User | Comment | |
|---|---|---|---|---|---|
| current | 09:39, 23 July 2012 | | 1,457 × 1,140 (222 KB) | Materialscientist | {{Information |Description ={{en|1=William Macewen (1848-1924) demonstrating his triangle to a group which includes Lane, Hirschfelder, Barkan, Stillman. }} |Source =http://ihm.nlm.nih.gov/images/B17743 |Author =Unknown |Date ... |
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