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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 The first statement of what later became Norton's theorem appeared in an unpublished BTL Patent Application dated November 3, 1926.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.