FR672442A - Improvements in means and devices for coding and deciphering messages - Google Patents

Improvements in means and devices for coding and deciphering messages

Info

Publication number
FR672442A
FR672442A FR672442DA FR672442A FR 672442 A FR672442 A FR 672442A FR 672442D A FR672442D A FR 672442DA FR 672442 A FR672442 A FR 672442A
Authority
FR
France
Prior art keywords
coding
devices
deciphering messages
deciphering
messages
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
Other languages
French (fr)
Inventor
Morgan Cypbian Mcmahon O'brien
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed filed Critical
Application granted granted Critical
Publication of FR672442A publication Critical patent/FR672442A/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09C—CIPHERING OR DECIPHERING APPARATUS FOR CRYPTOGRAPHIC OR OTHER PURPOSES INVOLVING THE NEED FOR SECRECY
    • G09C3/00—Typewriters for ciphering or deciphering cryptographic text
    • G09C3/04—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—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 the connections being mechanical

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Theoretical Computer Science (AREA)
  • Accessory Devices And Overall Control Thereof (AREA)
  • Transmission Devices (AREA)
FR672442D 1928-04-04 1929-04-03 Improvements in means and devices for coding and deciphering messages Expired FR672442A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB10219/28A GB320315A (en) 1928-04-04 1928-04-04 Improvements in and relating to means or apparatus for coding and de-coding messages

Publications (1)

Publication Number Publication Date
FR672442A true FR672442A (en) 1929-12-27

Family

ID=9963788

Family Applications (1)

Application Number Title Priority Date Filing Date
FR672442D Expired FR672442A (en) 1928-04-04 1929-04-03 Improvements in means and devices for coding and deciphering messages

Country Status (4)

Country Link
US (1) US2046276A (en)
DE (1) DE562401C (en)
FR (1) FR672442A (en)
GB (1) GB320315A (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1225903B (en) * 1961-05-25 1966-09-29 Hamburger Hochbahn Ag Device for counting a door, lock or the like. People passing

Also Published As

Publication number Publication date
GB320315A (en) 1929-10-04
US2046276A (en) 1936-06-30
DE562401C (en) 1932-10-25

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