involving removable or interchangeable coding members, e.g. master tapes, punched cards

Typewriters for ciphering or deciphering cryptographic text > wherein the operative connections between the keys and the type-bars are automatically and continuously permuted, during operation, by a coding or key member > involving removable or interchangeable coding members, e.g. master tapes, punched cards

Typewriters for ciphering or deciphering cryptographic text (marking record carriers G06K) > wherein the operative connections between the keys and the type-bars are automatically and continuously permuted, during operation, by a coding or key member > involving removable or interchangeable coding members, e.g. master tapes, punched cards