参考文献
Stickstoffwerke GmbH
Patent: EP279812 , 1927 ;
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Stickstoffwerke GmbH
Patent: EP281611 , 1927 ;
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Caro, N.; Frank, A.
Patent: CH142732 , 1927 ;
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Caro, N.; Frank, A.
Patent: CH147997 , 1927 ;
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Caro, N.; Frank, A.
Patent: FR642658 , 1927 ;
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Franck, H. H.; Heimann, H.
Patent: DE467479 , 1926 ;
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Wittek, H.
Patent: DE574357 , 1930 ;
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Stickstoffwerke GmbH
Patent: IT283020 , 1929 ;