FR2217875A1 - - Google Patents

Info

Publication number
FR2217875A1
FR2217875A1 FR7404708A FR7404708A FR2217875A1 FR 2217875 A1 FR2217875 A1 FR 2217875A1 FR 7404708 A FR7404708 A FR 7404708A FR 7404708 A FR7404708 A FR 7404708A FR 2217875 A1 FR2217875 A1 FR 2217875A1
Authority
FR
France
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.)
Granted
Application number
FR7404708A
Other languages
French (fr)
Other versions
FR2217875B1 (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.)
Gretag AG
Original Assignee
Gretag AG
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 to CH202673A priority Critical patent/CH574692A5/xx
Application filed by Gretag AG filed Critical Gretag AG
Publication of FR2217875A1 publication Critical patent/FR2217875A1/fr
Application granted granted Critical
Publication of FR2217875B1 publication Critical patent/FR2217875B1/fr
Expired legal-status Critical Current

Links

Classifications

    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04KSECRET COMMUNICATION; JAMMING OF COMMUNICATION
    • H04K1/00Secret communication
    • H04K1/04Secret communication by frequency scrambling, i.e. by transposing or inverting parts of the frequency band or by inverting the whole band
FR7404708A 1973-02-13 1974-02-12 Expired FR2217875B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CH202673A CH574692A5 (en) 1973-02-13 1973-02-13

Publications (2)

Publication Number Publication Date
FR2217875A1 true FR2217875A1 (en) 1974-09-06
FR2217875B1 FR2217875B1 (en) 1978-05-12

Family

ID=4224178

Family Applications (1)

Application Number Title Priority Date Filing Date
FR7404708A Expired FR2217875B1 (en) 1973-02-13 1974-02-12

Country Status (11)

Country Link
JP (1) JPS49119502A (en)
CA (1) CA1003137A (en)
CH (1) CH574692A5 (en)
DE (1) DE2318489C3 (en)
FR (1) FR2217875B1 (en)
GB (1) GB1465393A (en)
IT (1) IT1019573B (en)
NL (1) NL7401441A (en)
NO (1) NO140401C (en)
SE (1) SE392556B (en)
ZA (1) ZA7400916B (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2318247C3 (en) * 1973-04-11 1981-03-26 Siemens Ag, 1000 Berlin Und 8000 Muenchen, De
JPS5824984B2 (en) * 1976-06-02 1983-05-24 Mitsubishi Electric Corp

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR977153A (en) * 1948-10-27 1951-03-28 Radio Electr Soc Fr telephone communication system secret
FR1169671A (en) * 1957-03-08 1959-01-05 Thomson Houston Comp Francaise Improvements in telephone systems
US3225142A (en) * 1961-12-18 1965-12-21 Bell Telephone Labor Inc Privacy system
FR2001772A6 (en) * 1968-02-12 1969-10-03 Patelhold Patentverwertung
FR2101561A5 (en) * 1970-07-07 1972-03-31 Patelhold Patentverwertung

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1620656A (en) * 1924-12-01 1927-03-15 Western Electric Co Carrier-wave signaling system
US3201517A (en) * 1944-04-12 1965-08-17 Bell Telephone Labor Inc Privacy communication system
CH361597A (en) * 1958-08-23 1962-04-30 Patelhold Patentverwertung Method for masking of message signals
FR95619E (en) * 1966-05-05 1971-03-26 It Telecommunicazioni Siemens telephone signal transmission system has time allocation.
FR2129013A5 (en) * 1971-03-11 1972-10-27 Snecma

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR977153A (en) * 1948-10-27 1951-03-28 Radio Electr Soc Fr telephone communication system secret
FR1169671A (en) * 1957-03-08 1959-01-05 Thomson Houston Comp Francaise Improvements in telephone systems
US3225142A (en) * 1961-12-18 1965-12-21 Bell Telephone Labor Inc Privacy system
FR2001772A6 (en) * 1968-02-12 1969-10-03 Patelhold Patentverwertung
FR2101561A5 (en) * 1970-07-07 1972-03-31 Patelhold Patentverwertung

Also Published As

Publication number Publication date
GB1465393A (en) 1977-02-23
NO140401C (en) 1979-08-22
NO740416L (en) 1974-08-14
ZA7400916B (en) 1974-12-24
DE2318489C3 (en) 1982-12-23
CH574692A5 (en) 1976-04-15
CA1003137A1 (en)
SE392556B (en) 1977-03-28
JPS49119502A (en) 1974-11-15
DE2318489A1 (en) 1974-08-15
FR2217875B1 (en) 1978-05-12
DE2318489B2 (en) 1979-05-03
IT1019573B (en) 1977-11-30
NO140401B (en) 1979-05-14
NL7401441A (en) 1974-08-15
CA1003137A (en) 1977-01-04

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Legal Events

Date Code Title Description
ST Notification of lapse