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1939-01-16
Zementationsschmelzbad
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1914-01-02
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DE493827C
(de )
1930-03-12
Verfahren zur Verbesserung der Korrosionsbestaendigkeit von Formstuecken aus Magnesiumlegierungen
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DE321684C
(de )
1920-06-04
Verfahren zur Herstellung von Putzmitteln fuer Metall
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1900-01-01
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