Radium and polonium were discovered by - Marie Curie., The helicopter was invented by - Igor Sikorsky., Penicillin was discovered by - Alexander Fleming., The light bulb was invented by - Tomas Alva Edison., The steam engine was invented by - James Watt., The telephone was invented by - Alexander Bell., Dynamite was invented by - Alfred Nobel.,

Inventions and discoveries

بواسطة

لوحة الصدارة

النمط البصري

الخيارات

تبديل القالب

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