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Helmut Brueninghaus & Co Leder
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Helmut Brueninghaus & Co Leder
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Application filed by Helmut Brueninghaus & Co LederfiledCriticalHelmut Brueninghaus & Co Leder
Priority to DE1953B0015344priorityCriticalpatent/DE1668795U/en
Publication of DE1668795UpublicationCriticalpatent/DE1668795U/en
Process for the preparation of new 1- (3 ', 5'-dihydroxy- or -acyloxy-phenyl) -2-alkylaminoethanols and their physiologically acceptable acid addition salts
A method for producing an opening area of an index card intended for framing microfilm sections and an index card produced according to the method and provided with an opening