In 1929, ARC was founded through a merger of several smaller record companies, which, ultimately, transformed into one enterprise known as SME. In the depths of the Great Depression, the Columbia Phonograph Company (founded in 1888) in the U.S. (including its Okeh Records subsidiary) was acquired by ARC in 1934.
Okeh Records had whom as a subsidiary? (If the question is unanswerable, say "unanswerable")
unanswerable