Mayer´s and Norton´s theorems

It is a fact that Mayer was the first to publish the construction of a Parallel-Form Equivalent Generator for a given linear network. Perhaps Mayer was inspired by the existence of Thevenin´s Series-Form Equivalent Generator. In the United States, the Parallel-Form Generator was independently contributed by E.L. Norton of Bell Telephone Laboratories. However, his theorem was formulated specifically for the time-free periodic steady state, so it was not exactly the same as Mayer´s theorem. The first statement of what later became Norton´s theorem appeared in an unpublished BTL Patent Application dated November 3, 1926. This was the same month and year that Mayer´s theorem was published.