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Mar 7, 2017 at 22:07 vote accept pseudomarvin
Mar 7, 2017 at 21:18 answer added Bill Alsept timeline score: 0
Mar 7, 2017 at 20:38 answer added Farcher timeline score: 13
Mar 7, 2017 at 19:17 comment added HolgerFiedler Additional question: Which form has the spot for the observer if remove mirror M1 or mirror M2?
Mar 7, 2017 at 18:40 answer added user142930 timeline score: 2
Mar 7, 2017 at 16:03 history asked pseudomarvin CC BY-SA 3.0