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Phones and Hearing Aids
3 Views
The Birth of the Battery
Penicillin okokok
1 View
Light 2—The Photovoltaic Effect
0 View
Watt steam engine
Tesla 1
electric motor
The Secret of the Song Dynasty Refrigerator
2 Views
The story of the refrigerator's birth
Newton's telescope
The story of the birth of the elevator
air conditioner
How air conditioning was born
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2:13
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2:06
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