Patent classifications
G
PHYSICS
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G09
EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
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G09C
CIPHERING OR DECIPHERING APPARATUS FOR CRYPTOGRAPHIC OR OTHER PURPOSES INVOLVING THE NEED FOR SECRECY
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3/00
Typewriters for ciphering or deciphering cryptographic text
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G09C3/04
wherein the operative connections between the keys and the type-bars are automatically and continuously permuted, during operation, by a coding or key member
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