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Procédé de fabrication de l'anhydride 4-chlorophtalique.
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Verfahren zur Erhoehung des Gehalts der Thomasschlacke an gebundener Kieselsaeure
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Treatment of gold and silver ores |
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(instruction)
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(fr)
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Masse filtrante pour masque antigaz contre l'acide cyanhydrique, et procédé pour sa fabrication.
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Мешалка дл агитации каолинов и глин перед их обогащением
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(instruction)
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Valorisation des resines sulfitiques
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(instruction)
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