Wow!
I'm more used to the " what's this worth" questions!
May I ask how you would place the lower graph within the 75 lines?
Shouldn't this be a traditional "tree" starting with Mr. Brandt's bench?
Marine is a line, is the Naiad a sub-branch of marine?
You show the modern 4 categories but I would be puzzled as to how you fit these 4 into the 75.
Get ready for some opinions , my friend!
Interesting post!
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