National Lead was one of the 12 companies tracked by this "average" when it debuted May 26, 1896
[DOC] [TLE] Chicago Lock - Revolvy [PAR] The popular history of the company was that it began as a lightning rod 
manufacturer, later they grew into a furniture builder ... National Lead was one of 
the 12 original stocks included in the Dow Jones Industrial Average at the time of 
its creation on May 26, 1896.