技術的インフォメーション

 

All together two editions are known; out of the year
                                      1940  and 1970

                                          (ドイツ語)

  Hell Technische Mitteilungen Heft 1 1940   Hell Technische Mitteilungen Heft 2 1970
 
Edition of 1940
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Edition of 1970
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7,05 Mbyte