"Questions Kids Ask About Inventions (Questions Kids Ask, 13)"

Who invented frozen food? Who invented matches? Who invented braille? Who invented zippers? When was the toothbrush invented? When was writing invented? When were balloons invented? Do inventors become rich and famous? Who invented chewing gum?

Wedi'i Gadw mewn:
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Prif Awdur: Grolier Limited
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Iaith:anh
Cyhoeddwyd: Grolier Limited 1989
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SVKM J.V. Parekh International School, Mumbai - B9

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