The Camel F.1 had two Vickers guns. The Camel 2F.1 only had one Vickers gun, and a Lewis gun was mounted atop the wing.
The Vickers - machine gun - was developed based on the Maxim machine gun which was first real automatic machine gun. Vickers was an improvement and fired the .303 cartridge - extremely accurate and reliable. Used by British army during the first world war and following for many years.
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450 - 650
It wasn't soldiers who invented machine guns.
720 rounds a minute approximately
Some examples (but this is probably not the entire list) include:Maxim MG'08 (Germany)Maxim M1910 (Soviet Union)Vickers (United Kingdom)Springfield M1917 (United States)Chauchat (France, United States)Hotchkiss M1909 (France, United States, United Kingdom)Hotchkiss M1914 (France, United States)Bergman MG15 (Germanyand many othersOperations wise-blowback, recoil, gas, They can be either open bolt or closed bolt, magazine fed, stripper clip fed, belt fed, drum fed, chute fed.
About 1,000.
It is impossible to give a definitive amount. Certainly many thousands.
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Machine guns, as we think of them today, were invented by Hiram Maxim. There were earlier battery guns (many barrels firing at once) but the Maxim machine gun was the first to use the energy of a fired cartridge to operate the gun.
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