No player has ever worn number 70 for Chicago.
Eric Nesterenko, "old elbows"
Pete Conacher, Bronco Horvath, Nick Mickoski, Dutch Reibel, Tod Sloan, Steve Witiuk and Bobby Hull. The # 9 is now retired within the Blackhawks organization.
Mike Hudson - 1988-90 Milan Tichy - 1992-93 Nathan Dempsey - 2002-04 James Wisniewski - 2006-09 Brandon Saad - 2011-12
You wore 'threads' in the seventies.
In 2010, wide receiver Johnny Knox wore #13 for the Chicago Bears.
They wore them around their necks.
Michael Jordan wore number 23 on the Chicago Bulls.
As far as I know there is nobody currently wearing the number 68 but Jaromir Jagr, Milan Jurcina, and Zigmund Palffy wore it.