Electric Lamps
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- čas přidán 21. 02. 2023
- Thomas Alpha Edison - Discovering electricity - Natural sources of light - Artificial sources of light - electric bulb - florescent lamps - Types of Bases of Lamps - Argon gas - Mercuric vapor - Phosphoric materials - Copper and lead wires - Tungsten filament
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بالتوفيق إن شاء الله
اللهم آمين