FR678378A - Device ensuring the secrecy of electrical communications - Google Patents

Device ensuring the secrecy of electrical communications

Info

Publication number
FR678378A
FR678378A FR678378DA FR678378A FR 678378 A FR678378 A FR 678378A FR 678378D A FR678378D A FR 678378DA FR 678378 A FR678378 A FR 678378A
Authority
FR
France
Prior art keywords
secrecy
electrical communications
device ensuring
ensuring
communications
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
Nicolaas Koomans
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 FR678378A publication Critical patent/FR678378A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04K—SECRET COMMUNICATION; JAMMING OF COMMUNICATION
    • H04K1/00—Secret communication

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)
FR678378D 1928-07-14 1929-07-12 Device ensuring the secrecy of electrical communications Expired FR678378A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE315671X 1928-07-14

Publications (1)

Publication Number Publication Date
FR678378A true FR678378A (en) 1930-03-21

Family

ID=6150251

Family Applications (1)

Application Number Title Priority Date Filing Date
FR678378D Expired FR678378A (en) 1928-07-14 1929-07-12 Device ensuring the secrecy of electrical communications

Country Status (3)

Country Link
FR (1) FR678378A (en)
GB (1) GB315671A (en)
NL (1) NL25801C (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3157874A (en) * 1959-06-22 1964-11-17 Thompson Ramo Wooldridge Inc Signalling systems

Also Published As

Publication number Publication date
NL25801C (en)
GB315671A (en) 1930-05-29

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