This is the type of clothing that was worn by senior toolmakers and employees in the Quality Control Lab of the Millers Falls Company of Greenfield and Millers Falls, Massachusetts. Strict clean and climate-controlled environments were necessary in these factories that produced precision measuring tools. Toolmakers were the most highly qualified workers on the shop floor, and coats like this distinguished them from their fellow workers. Before World War II (WWII), the Millers Falls Tool Company made 2,500 different tools. During the war, the company continued manufacturing all its usual product lines (for example, electric tools, hand tools, hack saw blades, levels, planes, micrometers, etc.).