DEVICE FOR TRANSMISSION OF INFORMATION SIGNALS USING DIGITAL CONTROLLED DELTA MODULATION
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Device for entry encryption and for receiving encryption of information
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DATA PROCESSING DEVICE, IN PARTICULAR KEY DEVICE
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ELECTRIC DEVICE
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Circuit arrangement for encryption or decreasing sound information
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Keyboard for inputting data into an electric device
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Device operating with pulse code modulation and according to the time-division multiplex principle, for processing the information of a number of telephone channels
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Device operating with pulse code modulation and according to the time-division multiplex principle, for processing the information of a number of telephone channels
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ENCRYPTION AND DECRYPTION DEVICE IN THE SHAPE OF A TYPEWRITER
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ELECTRONIC ENCRYPTION AND DECCRYPTION DEVICE IN THE FORM OF A CALCULATOR
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Plug-in, programmable memory
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Decoder for orthographic text reproduction
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Data processing device especially for closure - has programmable store with interconnected elements controlled by relay switches
US4071693A
Method and apparatus for synchronizing a receiver end-key generator with a transmitter end-key generator
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Method and apparatus for the synchronization of a deciphering device functioning as a receiver with an enciphering device functioning as transmitter
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PLUG-IN PROGRAM MEMORY
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EQUIPMENT WITH A SENDING STATION AND A RECEIVING STATION FOR GENERATING, FORMING AND TRANSMITTING SIGNALS
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DEVICE FOR DECRYPTION OF THE PRESENT CHIFFS ON INFORMATION CARRIERS IN CHARACTERISTICS OF THE EQUAL NUMBER OF DIGITS
