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 "PM M1910"): The PM M1910 (Russian: Пулемёт Максима образца 1910 года, "Pulemyot Maxima obraztsa 1910 goda" or "Maxim's machine gun model 1910") was a heavy machine gun used by the Imperial Russian Army during World War I and the Red Army during Russian Civil War and World War II.
Relevant evidence: No