Hi,
It's Kabel (Rudolf Koch, 1926):
http://www.abstractfonts.com/search/?q=Kabel
Further Readings:
http://new.myfonts.com/fonts/linotype/kabel/ (english) see also
http://new.myfonts.com/fonts/linotype/kabel/alternate_cuts.html
http://moorstation.org/Koch_Memorial/type/kabel.htm (german)
Bye Bye
das samone now the name off this font
thanx
robby