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Refined by: author/creator: Hell Rudolf remove
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1
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Patent
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Procédé pour la fabrication de bandes périodiques de code chiffrées à période extrêmement longue

Hell Rudolf 02 May 1957

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2
Material Type:
Patent
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Apparatus for producing punched coding tapes of very long period

Hell Rudolf 16 August 1960

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3
Material Type:
Patent
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Method of and apparatus for producing extended impulse combination sequences of extremely long period for use in coding machines

Hell Rudolf ; Koll Roman 08 May 1962

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4
Material Type:
Patent
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Apparatus for enciphering-deciphering teleprinter communications

Hell Rudolf ; Koll Roman 28 August 1962

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