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The first carbon microphone invented by British physicist David Edward Hughes. By unidentified author, published on Magasin Pittoresque, Paris, 1882
engineering invention wire electrical
Breadboard with cables close-up. Electronic construction development. Modern technologies, electronics, diy product engineering
Freehand edison yellow vintage light bulbs vector Graphics. Electricity and science technology colored drawing. Retro energy invention sketch. Fun idea Illustration. Antique design clip Art.
Researchers test blood samples in the laboratory. Researchers are inventing vaccines to treat COVID-19 virus.

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