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The conditioner was and improved invention. Someone made it and then another person made it more advanced.
How recent technological invention is have improved weather observing?
Some technological innovations during China's golden age include the invention of gunpowder, which revolutionized warfare; the development of papermaking techniques, which improved communication and education; and the invention of the compass, which transformed navigation.
the compass and the astrolabe.
they envented a navigation tool called the magnetic compass.
they envented a navigation tool called the magnetic compass.
wheels
Sonar SOund NAvigation Ranging
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The Improved Ironing board
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telegraph