FR585788A - Improvements to secret signaling systems - Google Patents

Improvements to secret signaling systems

Info

Publication number
FR585788A
FR585788A FR585788DA FR585788A FR 585788 A FR585788 A FR 585788A FR 585788D A FR585788D A FR 585788DA FR 585788 A FR585788 A FR 585788A
Authority
FR
France
Prior art keywords
signaling systems
secret signaling
secret
systems
signaling
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)
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.)
Thales SA
Original Assignee
Le Materiel Telephonique Thomson CSF
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
Priority claimed from US648647A external-priority patent/US1542565A/en
Priority claimed from US654803A external-priority patent/US1573924A/en
Priority claimed from US681346A external-priority patent/US1533311A/en
Application filed by Le Materiel Telephonique Thomson CSF filed Critical Le Materiel Telephonique Thomson CSF
Application granted granted Critical
Publication of FR585788A publication Critical patent/FR585788A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04K—SECRET COMMUNICATION; JAMMING OF COMMUNICATION
    • H04K1/00—Secret communication
    • H04K1/04—Secret communication by frequency scrambling, i.e. by transposing or inverting parts of the frequency band or by inverting the whole band
FR585788D 1923-06-30 1924-06-27 Improvements to secret signaling systems Expired FR585788A (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
US648647A US1542565A (en) 1923-06-30 1923-06-30 Secret signaling
US654803A US1573924A (en) 1923-07-31 1923-07-31 Secret signaling
US681346A US1533311A (en) 1923-12-18 1923-12-18 Secret signaling

Publications (1)

Publication Number Publication Date
FR585788A true FR585788A (en) 1925-03-06

Family

ID=27417815

Family Applications (1)

Application Number Title Priority Date Filing Date
FR585788D Expired FR585788A (en) 1923-06-30 1924-06-27 Improvements to secret signaling systems

Country Status (4)

Country Link
DE (1) DE466687C (en)
FR (1) FR585788A (en)
GB (3) GB218282A (en)
NL (1) NL16701C (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2132205A (en) * 1937-06-23 1938-10-04 Bell Telephone Labor Inc Secret transmission
DE1196713B (en) * 1962-08-30 1965-07-15 Deutsche Bundespost Procedure for voice encryption

Also Published As

Publication number Publication date
GB218282A (en) 1925-03-05
NL16701C (en)
DE466687C (en) 1928-10-13
GB226488A (en) 1925-06-25
GB219987A (en) 1925-10-30

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