PET or Portable Electric Tools was out of Geneva, Illinois, producing power tools from the 40's through the 60's. They first used the "Shopmate" name in 1958. They apparently made some products for Sears, Roebuck. There is a report that they may have been become part of the power tool line of G.W. Murphy, which was later acquired by the McGraw-Edison Company in 1972.
I recently acquired a "Hercules" drill that is identical, and that came with its original steel case:
So "Hercules" must have either been a Montreal business that sold PET drills under their own name, or just a different name used by PET to market their wares in Canada.
Below, my PET Shopmate sabre saw. Ah, the days of the all-alloy power tools!
|From the web|
|Popular Mechanics, January 1950|