Hotchkiss 13.2 mm machine gun

The Hotchkiss 13.2 mm machine gun (French: Mitrailleuse Hotchkiss de 13,2 mm), also known as the Hotchkiss M1929 machine gun (Mle 1929, Mle 1930, etc.), was a heavy machine gun, primarily intended for anti-aircraft use, designed and manufactured by French arms manufacturer Hotchkiss et Cie from the late 1920s until World War II, which saw service with various nations' forces, including Italy and Japan where the gun was built under license. == Development == In the 1920s, Hotchkiss developed a range of anti-aircraft automatic weapons in the 13.2, 25 and 37 mm calibers.

Source: Wikipedia — Hotchkiss 13.2 mm machine gun (CC BY-SA 4.0)