Who modified the paralleling technique with the introduction of the long-cone technique?

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C.Edmund Kells introduced the paralleling technique in 1896.Franklin W.McCormack reintroduced the paralleling technique in 1920.F.Gordon Fitzgerald modified the paralleling technique with the introduction of the long-cone technique.This is the technique currently used.Howard Riley Raper modified the bisecting technique and introduced the bite-wing technique in 1925.

Who Modified the Paralleling Technique with the Introduction of the Long-Cone