There is no word okeh in the Ojibwa language, in 1740 or at any other time.
One of the many proposed origins of the slang term "ok" is a Choctaw/Chickasaw word okeh (meaning "it is indeed") but this is generally considered to be incorrect.
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There is only one: 'OKEH'.
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Okeh Presents the Wayfaring Stranger was created in 1941-08.