GB481983A - Improvements in system of coding and decoding - Google Patents

Improvements in system of coding and decoding

Info

Publication number
GB481983A
GB481983A GB29679/36A GB2967936A GB481983A GB 481983 A GB481983 A GB 481983A GB 29679/36 A GB29679/36 A GB 29679/36A GB 2967936 A GB2967936 A GB 2967936A GB 481983 A GB481983 A GB 481983A
Authority
GB
United Kingdom
Prior art keywords
contacts
circuit
key
typewriter
brushes
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
GB29679/36A
Other languages
English (en)
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
International Business Machines Corp
Original Assignee
International Business Machines Corp
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 by International Business Machines Corp filed Critical International Business Machines Corp
Publication of GB481983A publication Critical patent/GB481983A/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
    • G09C3/02—Typewriters for ciphering or deciphering cryptographic text with auxiliary keys or keyboards acting on the original keys or keyboards

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Theoretical Computer Science (AREA)
  • Mechanical Operated Clutches (AREA)
  • Accessory Devices And Overall Control Thereof (AREA)
GB29679/36A 1936-05-22 1936-10-31 Improvements in system of coding and decoding Expired GB481983A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US81178A US2138639A (en) 1936-05-22 1936-05-22 System of coding and decoding

Publications (1)

Publication Number Publication Date
GB481983A true GB481983A (en) 1938-03-22

Family

ID=22162572

Family Applications (1)

Application Number Title Priority Date Filing Date
GB29679/36A Expired GB481983A (en) 1936-05-22 1936-10-31 Improvements in system of coding and decoding

Country Status (5)

Country Link
US (2) US2138639A (fr)
CH (1) CH38639A (fr)
DE (1) DE732804C (fr)
FR (1) FR827312A (fr)
GB (1) GB481983A (fr)

Also Published As

Publication number Publication date
CH38639A (de) 1907-11-15
FR827312A (fr) 1938-04-25
US2138639A (en) 1938-11-29
USRE22523E (en) 1944-07-25
DE732804C (de) 1943-03-19

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