Be it known that I, Joseph A. Williams, a citizen of the United States, residing in Cleveland, in the county of Cuyahoga and State of Ohio, have invented a certain new and useful Improvement in Ignition Apparaatus….
(U.S. Patent #1,092,417)
That coil was used on model T Fords here are a little bits of info you might like complete with a link for you to further read up on
In 1907 the K-W Ignition Company of Cleveland, Ohio had attempted to persuade the Ford Motor Company to adopt their magneto for the Ford Models N, R and S. Although K-W’s attempt was unsuccessful, it appears that Joseph A. Williams, president of K-W, continued to look for opportunities to hitch K-W Ignition Company's wagon to Ford Motor’s rising star.
With the adoption of ignition coils manufactured by the K-W Ignition Company in late 1912 or early 1913 the Ford Motor Company began a business relationship with K-W that would last almost fifteen years. While both companies prospered during the tenure of the relationship, there were times when difficulties arose between them. The most serious difficulty arose over Joseph Williams’ patent on the design of the K-W coil. Here is what is known of the story.