Talk:Norton Isolastic frame

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Isolastic derived from featherbed[edit]

Can someone please explain how the isolastic frame is derived from the featherbed? It is different in just about every aspect imaginable and was a clean sheet design, so where is the derivative nature of it? — Preceding unsigned comment added by 84.178.153.18 (talk) 16:58, 31 December 2012 (UTC)[reply]