<P> Meanwhile , in Portland , Oregon , Henry F. Phillips patented his own invention , an improved version of a deep socket with a cruciform slot , today known as the Phillips Screw . Phillips offered his screw to the American Screw Company , and after a successful trial on the 1936 Cadillac , it quickly swept through the American auto industry . With the Industrial Revival at the end of the Great Depression and the upheaval of World War II , the Phillips screw quickly became , and remains , the most popular screw in the world . A main attraction for the screw was that conventional slotted screwdrivers could also be used on them , which was not possible with the Robertson Screw . </P>
<P> Meanwhile , in Portland , Oregon , Henry F. Phillips patented his own invention , an improved version of a deep socket with a cruciform slot , today known as the Phillips Screw . Phillips offered his screw to the American Screw Company , and after a successful trial on the 1936 Cadillac , it quickly swept through the American auto industry . With the Industrial Revival at the end of the Great Depression and the upheaval of World War II , the Phillips screw quickly became , and remains , the most popular screw in the world . A main attraction for the screw was that conventional slotted screwdrivers could also be used on them , which was not possible with the Robertson Screw . </P>
when did phillips head screws come into use
when did phillips head screws come into use
1936
1936