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Application filed by Ingbureausecuritas NvfiledCriticalIngbureausecuritas Nv
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Publication of AT98642BpublicationCriticalpatent/AT98642B/en
AT98642D1921-05-231922-05-22
Electric encryption and decryption device for converting a sequence of digits into a sequence of letters and vice versa.
AT98642B
(en)