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Process for the preparation of products of condensation of the aldehyde to the times with formic acid or 1 - 2 - aminonaphtalinemono - or disulphonic acids and aromatic oxysulphonyl
Process for the preparation of products of condensation of the aldehyde to the times with formic acid or 1 - 2 - aminonaphtalinemono - or disulphonic acids and aromatic oxysulphonyl