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  • 20:1220:12, 28 April 2013 diff hist +384 Product design 3rd par. of 3rd sec. after the intro is directly supportive, plus other parts are useful for other points in the article. As noted, there are many sources for this common point about PD; if another is preferred, please flag or comment w/o full deletion.
  • 13:3213:32, 28 April 2013 diff hist +285 Product design Provided a reference for the engineering-design aspect; this is just one possibility (a Wiki-based page run by Delft).

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