GB481983A - Improvements in system of coding and decoding - Google Patents
Improvements in system of coding and decodingInfo
- 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
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)
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 (de) |
CH (1) | CH38639A (de) |
DE (1) | DE732804C (de) |
FR (1) | FR827312A (de) |
GB (1) | GB481983A (de) |
-
1906
- 1906-12-01 CH CH38639A patent/CH38639A/de unknown
-
1936
- 1936-05-22 US US81178A patent/US2138639A/en not_active Expired - Lifetime
- 1936-08-31 DE DED73406D patent/DE732804C/de not_active Expired
- 1936-10-31 GB GB29679/36A patent/GB481983A/en not_active Expired
-
1937
- 1937-05-21 FR FR827312D patent/FR827312A/fr not_active Expired
-
1943
- 1943-09-18 US US22523D patent/USRE22523E/en not_active Expired
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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