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  • Nachbur, H.; Maeder, A.
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    Process for the Manufacture of Phosphorus-Containing Condensation Products, the Products and Their Use as Flameproofing Agents.
    Ciba-Geigy AG, Basel, Switzerland
    U.S. Patent 3,874,911
    U.S. Patent 3,874,911
    April 1, 1975
    9 p.