May 15, 2011 12:23: Steffen Walter changed "Field (write-in)" from "efffects of underground blasting for mining purposes" to "effects of underground blasting for mining purposes"

May 17, 2011 06:30: Steffen Walter Created KOG entry

May 17, 2011 06:31: Steffen Walter changed "Edited KOG entry" from "<a href="/profile/34047">Steffen Walter's</a> old entry - "Beanspruchung of Zug"" to ""tensile stress(es) / tensile load(ing)""