Original World War 2 business industry trade magazine vintage ad for JENKINS BROTHERS. Main office and factory was located in New York City, NY.  Why You Can Never Make Up For Lost Production.  When production slows down today, the chances are that adequate equipment and adequate protection are denied to the man at the front.  Without sufficient planes, tanks, guns, he is at the enemy's mercy. Jenkins Valves. Old 1943 WW2 era propaganda magazine advertisement.