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United States Inventions (1870-1920) Earmuffs were invented by Chester Greenwood in 1873, when he was only fifteen years old. Earmuffs were made for safety purposes, and it consisted of a metal or plastic headband attatching the two muffs together. The first electric dental drill was patented by George F. Green in 1875.What are the factors of 1870?
The factors of 1870 are listed with the smallest number first, which is 1, and the largest number last, which is 1870. 1, 2, 5, 10, 11, 17, 22, 34, 55, 85, 110, 170, 187, 374, 935, 1870 Note that all factors of 1870 are whole postive numbers. In other words, the factors of 1870 are postive integers that go evenly into 1870.What was the population of the US in 1870?
The United States Census of 1870 was the ninth United States Census. It was done by the Census Bureau in June 1870. The 1870 Census was the first census to give detailed information on the black population. The population was 38,555,983 individuals. This was a 22.62% increase since 1860.