wherein the operative connections between the keys and the type-bars are automatically and continuously permuted, during operation, by a coding or key member

Introduced: September 1968

Last revised: January 2006

Full Title

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

Classification Context

Section:: PHYSICS
Class:: EDUCATING; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
Subclass:: CIPHERING OR DECIPHERING APPARATUS FOR CRYPTOGRAPHIC OR OTHER PURPOSES INVOLVING THE NEED FOR SECRECY

3 direct subcodes

Child Classifications

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G09C 3/06 the connections being mechanical
G09C 3/08 the connections being electrical
G09C 3/1 involving removable or interchangeable coding members, e.g. master tapes, punched cards