File:Incandescent Electric Lighting - Efficiency - Fig 12.png
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Captions
Captions
Fig. 12.
Summary
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| Description |
English: Fig. 12. |
| Date | |
| Source | https://en.wikisource.org/wiki/Page:Incandescent_electric_lighting-_A_practical_description_of_the_Edison_system.djvu/144 |
| Author | Louis H. Latimer |
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