Fax machine was invented by
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Who Invented Traffic Signal ?
Who dicovered X-rays?
In 1985 the physicist Wilhelm Rontgen discovered X-rays, the "X" signifying their unknown origin.He later found that the rays could pass through flesh and by using photographic plates could make images of bones inside the body.
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The cause of Beri Beri was discovered by
Who invented the battery?
Telegrahic code was introduced by
Who invented Radar ?
Robert Watson Watt
The Solar System was discoverd by
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