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I copy the summary from en.wiki
Beschreibung
Author: Ueda
This is historical picture of the first active mirror.
I asked the Author to release such an image for the Public Domain,
in order to post it at Wikipedia, and I just got his permission,
together with this picture.
== Summary == Author: Ueda This is historical picture of the first active mirror. The detailed desctiption is at <ref>{{cite web| work=| url=http://bookstore.spie.org/index.cfm?fuseaction=detailpaper&cachedsearch=1&productid=143686&producttype=pdf&CFID