The regular Fender / Seymour-Duncan circuit is fine for humbuckers and a 3-way, where the neck ground isn't part of the switching logic. You run into trouble, however, with a 4-way, where switching the neck ground on and off controls the neck pickup activation.
This attempts to overcome this.
Of course I could use two push-pulls and coil split each humbucker individually, but I really can't see the point of that.
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Name: Tele Type w 2 Humbuckers Single Push-Pull Dual Coil Split and Fender 4-Way Blade Rev A1.png
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This attempts to overcome this.
Of course I could use two push-pulls and coil split each humbucker individually, but I really can't see the point of that.