Comp. de Bethune
Patent: US1965792 , 1932 ;

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Comp. de Bethune
Patent: DE580450 , 1932 ;

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Horclois
Chim. et Ind. Sonderband 13. Congr. Chim. ind. Lille, 1933 , p. 357,361
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Comp. de Bethune
Patent: FR728998 , 1931 ;