Again, see the RHHDAS H-O, pp. 323-324 ("juke" and "jukebox" and "juke
organ") and DARE I-O, pp. 163-164 ("jook" ).
I had found a "juke box" around the same time period in VARIETY.
The 1939 Barry Buchanan unpublished ENCYCLOPEDIA OF THE ENTERTAINMENT
WORLD might have "jukebox," but I haven't finished copying it.