Wired Design
The First Org Chart Ever Made Is a Masterpiece of Data Design
http://www.wired.com/design/2014/03/stunningly-complex-organization-chart-19th-century/
1855年につくられた New York and Erie Railroad 社の組織系統図「Diagram representing a plan of organization」．企業組織を系統樹的に可視化したもっとも古い例とのこと
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