OED's first citation is Time, 12 Jan. 1948, "The big news about 'fax'

was that, technically, the bugs were pretty well worked out of it."

Newsweek, 7 July 1947, pg. 53, col. 3, "SCIENCE: Faster Facsimile"

details the new "ultrafax" system by the Radio Corp. of America laboratories

at Princeton, NJ. Newsweek, 1 November 1948, pg. 50, had articles on

"Ultra-Fast Ultrafax" and "And Now Xerography."