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Dros Ginio - Pwy oedd y Cymro welodd donnau electromagnetaidd am y tro cyntaf? - 大象传媒 Sounds

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Pwy oedd y Cymro welodd donnau electromagnetaidd am y tro cyntaf?Pwy oedd y Cymro welodd donnau electromagnetaidd am y tro cyntaf?

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Hefyd roedd David Edward Hughes wedi helpu i ddyfeisio'r meicroffon a'r telegraff

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Dros Ginio
Pwy oedd y Cymro welodd donnau electromagnetaidd am y tro cyntaf?
Hefyd roedd David Edward Hughes wedi helpu i ddyfeisio'r meicroffon a'r telegraff
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