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In the immediate post-war period, the two former Mauser chief engineers, Karl Westinger and Ernst Altenburger, worked during the week in external companies.
After work, they developed a modern balancing machine with a combined electric and manual drive.
A mechanic was hired to build the prototype of this machine in an attic room in the so-called "Oberen Werk" in Oberndorf a.N., while the two engineers continued to earn the necessary money from outside.