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Horizontal and vertical milling machine.
Eli Whitney milling machine was invented in 1818
Milling machine for milling a flat surface. Stairs. Slot. And gear is made​​.
Milling machine to create a flat surface. Slot types. The gear. And many other parts are used.
It appears that in 1816 The Milling machine was invented to reduce hand filing of intricate shapes. (Simeon North, Harpers Ferry Armory USA) Later, in 1818, Whitney invented the first milling machine." From another source. A bit later in 1818 Eli Whitney (inventor of the cotton gin) invents a milling machine in New Haven Connecticut. Prior to the milling machine being invented, a machinist's tools were primarily files and required a highly skilled operator. The milling machine allowed a less skilled operator to make the same quality of parts as the skilled operator with the file. This milling machine found use making rifles for the government.