-
Period: to
1862
first transcontinental railroad -
Period: to
1870
first theoretical understanding of electricity -
Period: to
1878
light bulb -
Period: to
1881
1st lighting system -
Period: to
1885
mono tip + linotype -
Period: to
1892
ac because prin try electrical distrubtion -
Period: to
1902
1st controlled plane -
Period: to
1903
ford was introduded -
Period: to
1920
almost everyone in the u.s. has a car -
Period: to
1940s
computers -
Period: to
1950s
computer were commercially important