Original World War 2 business industry trade magazine vintage ad for SHELL INDUSTRIAL LUBRICANTS.  Glass Armor Sky High.  The ribbon of glass which flows, 24 hours a day, from the Libbey Owens Ford block long continuous glass drawing machine.  One of the biggest in the world, it presented a difficult lubrication problem, met by a Shell Industrial Lubricant.  Old 1943 WW2 wartime era propaganda magazine advertisement.