Original World War 2 tool industry trade magazine vintage ad for NORTON COMPANY of Worcester, MA.  There are Grindlins Too, As Well As Gremlins.  As the fiendish little Gremlins dance on the wings of the airplane, and ride the radio beams, just so, devilish little Grindlins tease and hamper the precision grinding machine operator.  Old 1943 dated WW2 wartime era magazine advertisement.