The Ckm wz. 30 was a Polish-made clone of what American heavy machine gun used by the United States in World War I, World War II, Korea and to a limited extent in Vietnam?
Ckm wz. 30:  30"; "heavy machine gun 1930 Pattern") is a Polish-made clone of the American Browning M1917 heavy machine gun. M1917 Browning machine gun: The M1917 Browning machine gun is a heavy machine gun used by the United States armed forces in World War I, World War II, Korea, and to a limited extent in Vietnam; it has also been used by other nations.
i don't know