That is a nice article, Dickeybird, and it does show how and why the involute varies in form for different diameter gears.
But, it does not explain how to geometrically generate an involute of a particular pressure angle. From the example, all one would get from generating an "unwound involute", is one unique pressure angle and no others would be possible. I'm not sure if 14.5° is the "natural pressure angle" of a drawn involute (I doubt it) but the question is interesting to ponder and imperative to answer before any gear tooth can be drawn with splines or whatever.
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