File:Incandescent Electric Lighting - Efficiency - Fig 6.png
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Fig. 6.
Summary edit
| Description |
English: Fig. 6. |
| Date | |
| Source | https://en.wikisource.org/wiki/Page:Incandescent_electric_lighting-_A_practical_description_of_the_Edison_system.djvu/138 |
| Author | Louis H. Latimer |
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