PV-1 machine gun
Encyclopedia
PV-1 is an air-cooled version of the Maxim machine gun
Russian M1910 Maxim
The PM M1910 was a heavy machine gun used by the Russian Army during World War I and the Red Army during World War II. It was adopted in 1910 and was derived from Hiram Maxim's Maxim gun, chambered for the standard Russian 7.62x54mmR rifle cartridge...

 for mounting on aircraft
Aircraft
An aircraft is a vehicle that is able to fly by gaining support from the air, or, in general, the atmosphere of a planet. An aircraft counters the force of gravity by using either static lift or by using the dynamic lift of an airfoil, or in a few cases the downward thrust from jet engines.Although...

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