In 1958, William D. Allison, the original designer of Packard's 1955056 Torsion-Level suspenion, demonstrated and explained his "Interdependent" torsional system to automotive journalist. An article in the March 1958 issue of Motor Trend magazine covers this event. Although not stated the article, it appears that the "Interdependent" system was a generalization and evolution of Torsion-Level.
Here are scans of the original article. Click on the thumbnail to view full size image (~500KB).
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Click here for an enlargement of the illustration of the "Interdependent" system for X-type frame, rigid rear axle, i.e,, like 1955-56 Packard Torsion-Level. Click here for an enlargement of the illustration of the "Interdependent" system for perimeter-type frame, modified swing axle, i.e,, like a "De Dion" type.
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