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DE607638C
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Encryption device
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DE536556C
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Electric cipher machine with writing device
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DE550796C
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Switching device for electrical encryption and decryption machines
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DE524754C
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Encryption device for electrical encryption and decryption machines
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DE541702C
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Device for electric cipher typewriters
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DE579555C
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Encryption device with encryption rollers
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DE534947C
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Electric encryption and decryption device
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DE554421C
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Electric cipher device
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DE452194C
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Electric device for encryption and decryption
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DE460457C
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Encryption device for use in encryption machines
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DE454392C
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Switching device for encryption and decryption machines
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DE407804C
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Electric key cipher
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DE425566C
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Electric encryption and decryption machine
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DE412582C
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Blocking of cipher elements in cipher machines
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