G09C3/04 - CPC Classification

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

• G09C3/06 » the connections being mechanical 0
• G09C3/08 » the connections being electrical 1
• G09C3/10 » involving removable or interchangeable coding members, e.g. master tapes, punched cards 0