1919 Dayton Engineering Labs AKA DELCO - Modernized Ignition - Ad #1939

This original 11 x 14" magazine ad from 1919 showcases Post WWI innovations that allowed DELCO, The Dayton Engineering Labs, of Dayton, Oho to be approved for use in FOUR major Airplane engines of the day.  Engine are shown in the ad, Packard, Hall-Scott, Liberty and Lorraine Dietrich.