The most important invention of the late 1900s and why?
2 answers:
Answer:
There's a lot. here are some examples:
Explanation:
1901 : Vacuum cleaner.
1902 : Air conditioning; automated tea maker.
1903 : Electrocardiogram; first powered flight.
1904 : Radar; tea bags; diodes.
1905 : Plastic; windscreen wipers; silencer for guns.
1906 : Radio broadcasting.
1907 : Electric washing machine.
Answer:
the escalator
Explanation:
because it allowed people who where tired from walking to rest while they were going up the steps
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Answer:
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Explanation: