Type 97 heavy tank machine gun

The Type 97 heavy tank machine gun (九七式車載重機関銃, Kyū-nana-shiki shasai jū-kikanjū) was the standard machine gun used in tanks, and armored vehicles the Imperial Japanese Army during World War II, and as a general purpose medium machine gun by infantry forces. This weapon was not related to the Type 97 aircraft machine gun used in several Japanese Navy aircraft including the Mitsubishi A6M Zero, or the Type 97 automatic cannon used as an anti-tank rifle.

Source: Wikipedia — Type 97 heavy tank machine gun (CC BY-SA 4.0)