When was the machine gun invented?
1884
Maxim and World War I
The first practical self-powered machine gun was invented in 1884 by Sir Hiram Maxim.
1836
Samuel Colt submitted a British patent for his revolver in 1835 and an American patent (number 138) on February 25, 1836 for a Revolving gun, and made the first production model on March 5 of that year. Another revolver patent was issued to Samuel Colt on August 29, 1839.
1884-1836=
48 years later the machine gun was invented