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Expired
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Antonio Montagna
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Individual
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Publication of GB191015734ApublicationCriticalpatent/GB191015734A/en
G09C—CIPHERING OR DECIPHERING APPARATUS FOR CRYPTOGRAPHIC OR OTHER PURPOSES INVOLVING THE NEED FOR SECRECY
G09C5/00—Ciphering apparatus or methods not provided for in the preceding groups, e.g. involving the concealment or deformation of graphic data such as designs, written or printed messages
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GB191015734D1909-11-061910-06-30Improvements in or relating to the Telegraphic and Telephonic Transmission of Pictures.
ExpiredGB191015734A
(en)