9-to-5 (1923?)

[Bapopik at AOL.COM]

_http://www.barrypopik.com/article/1246/from-nine-to-five_
(http://www.barrypopik.com/article/1246/from-nine-to-five)
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I just added this. The revised OED has 1936? Even a book title shows  1933.
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Did Robert Benchley coin or popularize this?