Question: 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?
Sentence (from "Ckm wz. 30"): 30"; "heavy machine gun 1930 Pattern") is a Polish-made clone of the American Browning M1917 heavy machine gun.
Relevant evidence: Yes